Top flea, perhaps? (6)
I believe the answer is:
jumper
This clue is a double definition.
'top' is the first definition.
(type of garment worn as a top)
'flea perhaps?' is the second definition.
(fleas jump very high)
(Other definitions for jumper that I've seen before include "that may be long for an athlete" , "Woollen garment" , "Pullover; circuit wire" , "Horse, athlete and knitted garment" , "Knitwear - bounder" .)