Love girl's curved shape (4)
I believe the answer is:
oval
'curved shape' is the definition.
(I've seen this before)
'love girl's' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'girl' becomes 'val' (short for Valerie**).
'o'+'val'='OVAL'
(Other definitions for oval that I've seen before include "Shaped like an egg" , "London cricket ground" , "Test site" , "Courageous" , "Curved shape" .)