Crossword Genius

A boss of a detective department who's hooked? (4,4)

Ross

I believe the answer is:

acid head

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

'a detective department who's hooked?' is the definition.
I can't tell whether this definition defines the answer.

'a boss' is the wordplay.
'boss' becomes 'cidhead' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'cidhead'='ACID-HEAD'

'of' is the link.

Can you help me to learn more?

(Other definitions for acid head that I've seen before include "One often on a trip" , "possibly keen to take pounds, shillings and pence?" , "one hooked on LSD!" , "LSD user" .)

I've seen this clue in The Guardian.
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