Sour fruit (4,5)
'sour fruit' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for crab apple that I've seen before include "Wild fruit used for jam" , "unappetizing fruit" , "Small sour version of common orchard fruit" , "A small sour fruit, part crustacean" , "Tart fruit for making jam and jelly" .)
'sour fruit' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lemon that I've seen before include "source of juice" , "Fruit high in vitamin C" , "Washout" , "definitely not a peach" , "Useless object" .)
(Other definitions for lemons that I've seen before include "Strangely melons could be citrus fruits" , "Could strange melons be citrus?" , "Citrus friuts" .)