Express an opinion about love and desire (5)
I believe the answer is:
opine
'express an opinion' is the definition.
(thesaurus)
'love and desire' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'and' says to put letters next to each other.
'desire' becomes 'pine'.
'o'+'pine'='OPINE'
'about' is the link.
(Other definitions for opine that I've seen before include "State as one's belief" , "State one's held view" , "Express a point of view" , "judge" , "Suggest" .)