Fruit raised by unknown woman (5)
I believe the answer is:
emily
'woman' is the definition.
'fruit raised by unknown' is the wordplay.
'fruit' becomes 'lime' (lime is a kind of fruit).
'raised by' says the letters should be written backwards.
'unknown' becomes 'y' (algebra).
'lime' back-to-front is 'emil'.
'emil'+'y'='EMILY'
(Other definitions for emily that I've seen before include "A Bronte sister" , "Girl" , "-- Dickinson, US poet" , "Literary sister" , "Girl's name" .)