Exaggerate love with poem full of rubbish (9)
I believe the answer is:
overstate
'exaggerate' is the definition.
(synonyms)
'love with poem full of rubbish' is the wordplay.
'love with' becomes 'o' (love means zero in tennis. I am not sure about the 'with' bit.).
'poem' becomes 'verse' (verse is a kind of poem).
'full of' is an insertion indicator.
'rubbish' becomes 'tat' (low-quality items or material).
'verse' enclosing 'tat' is 'verstate'.
'o'+'verstate'='OVERSTATE'
Can you help me to learn more?
(Other definitions for overstate that I've seen before include "Exaggerate, go beyond bounds of truth" , "Exaggerate, make too much of" , "lay it on thick" .)