Across
1 Across Ugh or, upset, coarse (5) → ROUGH Anagram
Anagram of “ugh or”.
4 Across Decline hidden within codes central to policy (7) → DESCENT Hidden word
Hidden inside “codes central”.
7 Across Columbo rearranged, unit of charge (7) → COULOMB Anagram
Anagram of “Columbo”.
9 Across Deed housed within Roman numeral 101, prickly plants (5) → CACTI Container
ACT inside CI.
11 Across Ballad, ol', turned back, faithful (5) → LOYAL Reversal
LAY OL reversed.
12 Across Another, rearranged, in the world (2,5) → ON EARTH Anagram
Anagram of “another”.
13 Across To start, elephant, lion, llama, old unit of length (3) → ELL Initialism
First letters of: elephant, lion, llama.
15 Across Paragon, or a mannequin (5) → MODEL Double definition
Two separate definitions of the same word.
17 Across Decay, turned back, is craggy hill (3) → TOR Reversal
ROT reversed.
18 Across Brain regions: Thai concealing a blow (7) → THALAMI Container
LAM inside THAI.
20 Across Rift found regularly in sip, plaint (5) → SPLIT Alternate letters
Every other letter of “sip plaint”, starting with the first.
22 Across Hearts of ads, bit, use, ace, top, dance party (5) → DISCO Middle letters
Middle letters of: ads, bit, use, ace, top.
23 Across Nine lev muddled, animate (7) → ENLIVEN Anagram
Anagram of “nine lev”.
24 Across Stock found within airline agent (7) → LINEAGE Hidden word
Hidden inside “airline agent”.
25 Across Positive southeast group hunting outlaws (5) → POSSE Charade
POS + SE.
Down
1 Down Remembered, or composed (11) → RECOLLECTED Double definition
Two separate definitions of the same word.
2 Down Year, usually, mounting extortion (5) → USURY Reversal
YR USU reversed.
3 Down Disordered loom, duh, young thug (7) → HOODLUM Anagram
Anagram of “loom duh”.
5 Down Openers of six ugly clowns run errands, old currency (5) → SUCRE Initialism
First letters of: six, ugly, clowns, run, errands.
6 Down Extract from ex crept, jumbled (7) → EXCERPT Anagram
Anagram of “ex crept”.
8 Down Pedigree from vital fluid plus queue (9) → BLOODLINE Charade
BLOOD + LINE.
10 Down Legacy from ancient heir, reshuffled (11) → INHERITANCE Anagram
Anagram of “ancient heir”.
14 Down Secret affair when I sail on, adrift (7) → LIAISON Anagram
Anagram of “I sail on”.
16 Down Final circuit from splat, Al, in disarray (4,3) → LAST LAP Anagram
Anagram of “splat al”.
19 Down Fear of open spaces minus fear, ancient marketplace (5) → AGORA Deletion
AGORAPHOBIA without its final PHOBIA.
21 Down Molten flows from flatbread, curtailed (5) → LAVAS Deletion
LAVASH without its final H.
