Crossword Genius

Drug discovered by a police department (4)

Ross

I believe the answer is:

acid

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

'by a police department' is the wordplay.
'by' says to put letters next to each other.
'police department' becomes 'CID' (abbreviation for Criminal Investigation Department).
'a'+'cid' is 'ACID'.

'discovered' is the link.

(Other definitions for acid that I've seen before include "Bitter - drug" , "Tart - keen - sort of house party" , "bad rain" , "Chemical compound" , "scathing" .)

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