Lemon or apple (5)
I believe the answer is:
fruit
I believe this clue is a double definition.
'lemon' is the first definition.
(thesaurus)
'apple' is the second definition.
(thesaurus)
(Other definitions for fruit that I've seen before include "Kiwi, mandarin etc" , "Greengrocer's produce" , "Result - food" , "Seed-bearing growth" , "Eg, apple or pear" .)