Flat pastry and fruit go wrong when served up (4-1-5)
I believe the answer is:
pied-a-terre
'flat' is the definition.
(I've seen this before)
'pastry and fruit go wrong when served up' is the wordplay.
'pastry' becomes 'pie' (pie is a kind of pastry).
'and' is a charade indicator (letters next to each other).
'fruit go' becomes 'date' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'wrong' becomes 'err' (to err is make an error).
'when served up' shows that the letters should be reversed in order.
'err' written backwards gives 'rre'.
'pie'+'date'+'rre'='PIED-A-TERRE'
Can you help me to learn more?
(Other definitions for pied-a-terre that I've seen before include "Small home kept for occasional use" , "Lodging kept for occasional use (French)" , "bijou accommodation" , "Small secondary flat or house" , "Dwelling for occasional use" .)