She hasn't a single apple left! (5)
I believe the answer is:
pearl
'she' is the definition.
'hasn't a single apple left' is the wordplay.
I cannot quite see how this works, but
'a' is present in the answer.
'left' could be 'l' (common abbreviation) and 'l' is found within the answer.
The remaining letters 'per' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for pearl that I've seen before include "greatly valued" , "Gem from oyster" , "Precious gem" , "Girl < , pretty" , "one regularly in stitches" .)