Love changes seeing female organs (7)
I believe the answer is:
ovaries
'female organs' is the definition.
(I've seen this before)
'love changes' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'changes' becomes 'varies' ('vary' can be a synonym of 'change').
'o'+'varies'='OVARIES'
'seeing' acts as a link.
(Other definitions for ovaries that I've seen before include "egg production unit" , "Egg-producing organs in female animals" .)