Crossword Genius

Sharp as a group of detectives (4)

Ross

I believe the answer is:

acid

'sharp' is the definition.
(as in sharp-tasting)

'a group of detectives' is the wordplay.
'group of detectives' becomes 'CID' (Criminal Investigation Department).
'a'+'cid'='ACID'

'as' acts as a link.

(Other definitions for acid that I've seen before include "Sharp - tart - kind of house party" , "Caustic liquid of many kinds" , "something sharp" , "Tart - keen - sort of house party" , "Corrosive liquid; drug" .)

I've seen this clue in The Mirror and The Daily Express.
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