Crossword Genius

Drug from a police department (4)

Ross

I believe the answer is:

acid

'drug' is the definition.
(acid is a kind of drug)

'a police department' is the wordplay.
'police department' becomes 'cid' (I've seen this in other clues).
'a'+'cid'='ACID'

'from' acts as a link.

(Other definitions for acid that I've seen before include "Substance with pH of less than 7" , "Substance which turns litmus red" , "scathing" , "Bitter or sour" , "Chemical compound" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app