Cartoon bore claiming victory (7)
I believe the answer is:
drawing
'cartoon' is the definition.
(thesaurus)
'bore claiming victory' is the wordplay.
'bore' becomes 'drag' (I've seen this before).
'claiming' indicates putting letters inside.
'victory' becomes 'win' (a win is a victory).
'drag' placed around 'win' is 'DRAWING'.
(Other definitions for drawing that I've seen before include "Enticing" , "A sketch or design" , "Pencilled picture" , "Hand sketch" , "Picture, sketch" .)