Crossword Genius

Sharp as a group of police (4)

Ross

I believe the answer is:

acid

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

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

'as' is the link.

(Other definitions for acid that I've seen before include "Bitter substance" , "So-called drug" , "See 4 Across" , "- - -drop, sweet" , "Bitter; biting" .)

I've seen this clue in The Mirror.
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