Opposed to carbon stunt (5)

I believe the answer is:

antic

'stunt' is the definition.

'opposed to carbon' is the wordplay.
'opposed to' becomes 'anti' (anti means opposing something).
'carbon' becomes 'C' (chemical symbol).
'anti'+'c'='ANTIC'

(Other definitions for antic that I've seen before include "Caper; grotesque (arch.)" , "Caper, trick" , "Tomfoolery" , "Absurd action" , "Playful or mischievous act" .)

I've seen this clue in the Sydney Morning Herald.

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