Devotee into pop art is a numpty (8)

I believe the answer is:

partisan

'devotee' is the definition.
(I've seen this before)

'into pop art is a numpty' is the wordplay.
'into' indicates the answer is hidden within the clue.
'PARTISAN' can be found hidden inside 'pop art is a numpty'.

(Other definitions for partisan that I've seen before include "Prejudiced towards a particular cause" , "Guerrilla" , "Highly biased" , "Devotee of a cause" , "of prejudiced views" .)

I've seen this clue in The Times.

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