Fruit no lovers want? (10)
I believe the answer is:
gooseberry
I believe this is a double definition.
'fruit' is the first definition.
(I know that gooseberry is a type of currant)
'no lovers want?' is the second definition.
(gooseberry can mean an extra person with a couple)
(Other definitions for gooseberry that I've seen before include "it bears fruit" , "One unwelcome near passion" , "Some intruders play it" , "Fruit - unwanted third person" , "Third-party" .)