Figure love can’t go wrong (7)
I believe the answer is:
octagon
'figure' is the definition.
(type of geometrical figure)
'love can't go wrong' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'wrong' is an anagram indicator.
'cant'+'go'='cantgo'
'cantgo' is an anagram of 'ctagon'.
'o'+'ctagon'='OCTAGON'
(Other definitions for octagon that I've seen before include "regular form" , "Figure of many sides" , "Eight-sided figure" , "Eight-sided room" , "Shape of a square with the corners cut off" .)