Excellent jumper with flaw? (3-4)
I believe the answer is:
top-hole
'excellent' is the definition.
(I've seen this before)
'jumper with flaw?' is the wordplay.
'jumper' becomes 'top'.
'with' is a charade indicator (letters next to each other).
'flaw?' becomes 'hole' (as in a hole in one's logic).
'top'+'hole'='TOP-HOLE'
(Other definitions for top-hole that I've seen before include "First-rate" , "Excellent" .)