Lots love line in poetry (6)
I believe the answer is:
oodles
'lots' is the definition.
(informal term for a large amount)
'love line in poetry' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'line' becomes 'l' (used when specifying particular lines from a poem).
'in' is an insertion indicator.
'poetry' becomes 'odes' (ode is a type of poem).
'l' put into 'odes' is 'odles'.
'o'+'odles'='OODLES'
(Other definitions for oodles that I've seen before include "Loosed among lots" , "Lashings, loads" , "Lots (colloq.)" , "Bags" , "Tons, scads" .)