Crossword Genius

Drug user revealed by a top detective? (4-4)

Ross

I believe the answer is:

acid-head

I'm a little stuck... Click here to teach me more about this clue!

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

'a top detective?' is the wordplay.
I cannot really see how this works, but
'a' is within the answer.
'top' could be 'head' (head is a kind of top) and 'head' is found in the answer.
The remaining letters 'cid' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'revealed by' is the link.

Can you help me to learn more?

(Other definitions for acid-head that I've seen before include "Drug-taker (slang)" , "LSD taker (slang)" , "Taker of hallucinogenic drugs (slang)" , "LSD tripper" , "LSD user" .)

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