Very small amount of venom in a lizard (7)

I believe the answer is:

nominal

'very small' is the definition.
(as in a nominal fee)

'amount of venom in a lizard' is the wordplay.
'amount of' says the answer is hidden in the clue (a certain amount of the clue).
'NOMINAL' can be found hidden inside 'venom in a lizard'.

(Other definitions for nominal that I've seen before include "So-called, but not in reality" , "unreal" , "Relating to names" , "Titular" , "Existing in name only" .)

I've seen this clue in The Guardian.

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