Work within a bit of a painting style (3-3)

I believe the answer is:

pop-art

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'a painting style' is the definition.
The definition suggests a singular noun which matches the answer.

'work within a bit of' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'within' means one lot of letters goes inside another.
'a bit of' becomes 'part'.
'op' put inside 'part' is 'POP-ART'.

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

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