Taste defeat (4)
I believe the answer is:
lick
I believe this clue is a double definition.
'taste' is the first definition.
(I've seen this before)
'defeat' is the second definition.
(lick can mean to beat or defeat)
(Other definitions for lick that I've seen before include "Lap; trounce" , "(At a) fast pace - beat conclusively" , "Jazz phrase" , "Feel with the tongue" , "Pass tongue over" .)