Flaky pastry (4)
I believe the answer is:
filo
'flaky pastry' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for filo that I've seen before include "Pastry made in thin sheets" , "Tissue-thin sheets of pastry" , "Thin flaky pastry" , "Pastry used for baklava" , "A type of very thin pastry" .)