Rant about love, perhaps, and betray (3,2)
I believe the answer is:
rat on
'betray' is the definition.
(synonyms)
'rant about love perhaps' is the wordplay.
'about' means one lot of letters go next to another.
'love' becomes 'o' (love means zero in tennis).
'perhaps' indicates an anagram.
'rant' after 'o' is 'orant'.
'orant' with letters rearranged gives 'RAT ON'.
'and' is the link.
(Other definitions for rat on that I've seen before include "Betray" , "shop" , "grass up" , "Give away" , "desert" .)