'Whaam!' is an example of this work, in part (3,3)
I believe the answer is:
pop art
'whaam is an example of this' is the definition.
(Whaam is a pop art artwork by Roy Lichtenstein)
'work in part' is the wordplay.
'work' becomes 'op' (common abbreviation for 'opus').
'in' is an insertion indicator.
'op' going within 'part' is 'POP-ART'.
(Other definitions for pop art that I've seen before include "Warhol's style" , "Striking pictures of everyday things" , "Apt pro (anag.)" , "Marilyn Diptych, perhaps" , "Creative movement" .)