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Officer is in charge of venomous types (11)

Ross

I believe the answer is:

copperheads

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

'venomous types' is the definition.
Although both the answer and definition are plural nouns, I don't see how they can define each other.

'officer is in charge of' is the wordplay.
'officer' becomes 'copper' (copper is a kind of officer).
'is in charge of' becomes 'heads' (I've seen this in another clue).
'copper'+'heads'='COPPERHEADS'

Can you help me to learn more?

(Other definitions for copperheads that I've seen before include "ophidians?" , "snakes" .)

I've seen this clue in The Times.
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