Fruit: love assortment (6)
I believe the answer is:
orange
'fruit' is the definition.
(orange is a kind of fruit)
'love assortment' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'assortment' becomes 'range' (I can't justify this - if you can you should give a lot more credence to this answer).
'o'+'range'='ORANGE'
Can you help me to learn more?
(Other definitions for orange that I've seen before include "A rainbow colour" , "Order of the North" , "Citrus fruit; colour" , "One's pipped" , "African flower" .)