Fifteensquared

Another lovely puzzle from Cincinnus. I particularly like 13A, 19A, 25A and 5D. I found 26A and 20D hard.

Across
1, 28. MAKING TRACKS - double definition
4. THE CHAMP - THE (article) + HAM (bad actor) in CP
9. ADD UP - A (a) + DD (doctor of divinity) + UP (at college)
10. JERKINESS - JERKIN (jacket) + [l]ESS (75% of “less”)
11. LOAFERS - anagram (fantastic) of FOR SALE
12. UNARMED - double definition
13. ASPS - AS (when) + P[oisonou[S]
14. ASTEROID - A (a) + STEROID (drug)
17. DIVISION - double definition
19. HALO - hidden word
22. ORLANDO - double definition
24. RAIMENT - RENT (tear) around AIM (object)
25. ROYAL MINT - anagram of NORMALITY
26. TITAN - hidden word
27. MURMANSK - MURK (darkness) around MAN (chap) + S (seafront)

Down
1. MEATLOAF - double definition
2. KIDNAPPED - “kid napped”
3. NIPPER - NIP (small drink) + PER (for each)
5. HERCULE POIROT - anagram of OUR HELICOPTER
6. CHICAGO - CHIC (elegant) + A (one) + GO (vitality)
7. ABEAM - A (a) + BEAM (shaft)
8. POSADA - PO (post office) + S (small) + ADA (girl)
10. JUST SO STORIES - JUST (only) + SOS (plea for help) + TORIES (right)
15. DIALECTIC - DIALECT (manner of speaking) + IC (one chapter)
16. FORTUNES - “for tunes”
18. VANILLA - ALL IN (comprehensive) + A (a) + V (civic centre) all reversed
20. POGROM - PO (Italian flower) + G (girl’s first) + ROM (memory)
21. BITTER - double definition
23. LAYER - anagram of EARLY