Seat possibly lost out of love? (5)
I believe the answer is:
stool
'seat' is the definition.
(stool is a kind of seat)
'possibly lost out of love?' is the wordplay.
'possibly' indicates anagramming the letters.
'out of' indicates putting letters inside.
'love?' becomes 'o' (In tennis, 'love' means 'zero').
'lost' is an anagram of 'stol'.
'stol' placed around 'o' is 'STOOL'.
(Other definitions for stool that I've seen before include "item of furniture here" , "Motion" , "Small seat" , "Three-legged backless seat" , "place butt on one?" .)