Crossword Genius

Corrosive stuff from ace detectives (4)

Ross

I believe the answer is:

acid

'corrosive stuff' is the definition.
(I've seen this in another clue)

'ace detectives' is the wordplay.
'ace' becomes 'a' (abbreviation).
'detectives' becomes 'CID' (abbreviation for Criminal Investigation Department).
'a'+'cid'='ACID'

'from' is the link.

(Other definitions for acid that I've seen before include "Morose" , "Bitter or sour" , "Sour - type of rain or drop" , "Opposite of alkali; sour" , "Caustic and biting" .)

I've seen this clue in The Sun.
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