Crossword Genius

Chief constable is a venomous creature (10)

Ross

I believe the answer is:

copperhead

I believe this clue is a double definition.

'chief constable' is the first definition.
(whimsically, the head of all 'coppers')

'venomous creature' is the second definition.
(venomous snake)

'is a' acts as a link.

(Other definitions for copperhead that I've seen before include "Venomous, reddish-brown American snake" , "Policeman brains snake" , "Reptile" , "Venomous type" , "Highly venomous US or Australian snake" .)

I've seen this clue in The Guardian.
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