Saver could be tougher about love (7)
I believe the answer is:
hoarder
'saver' is the definition.
(I've seen this before)
'tougher about love' is the wordplay.
'tougher' becomes 'harder' ('hard' can be a synonym of 'tough').
'about' indicates putting letters inside.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'harder' going around 'o' is 'HOARDER'.
'could be' is the link.
(Other definitions for hoarder that I've seen before include "Saver" , "One who accumulates things" , "18 [MAGPIE] , perhaps" , "Collector" , "Miser; magpie" .)