Looking embarrassed by love? Have another go (4)
I believe the answer is:
redo
'have another go' is the definition.
(to redo something is to have another go at it)
'looking embarrassed by love?' is the wordplay.
'looking embarrassed' becomes 'red' (someone may go red when embarrassed).
'by' is a charade indicator (letters next to each other).
'love?' becomes 'o' (love means zero in tennis).
'red'+'o'='REDO'
(Other definitions for redo that I've seen before include "Decorate (eg a room) again" , "Start again" , "Create again" , "Make anew" , "Fashion again" .)