Crinkled aluminium sheet used while making pastry (4)

I believe the answer is:

filo

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'pastry' is the definition.
(I know that filo is a type of puff pastry)

I don't understand the remainder of the clue.

(Other definitions for filo that I've seen before include "Pastry used for baklava" , "Pastry made in thin sheets" , "A type of very thin pastry" , "Kind of pastry" , "Thin flaky pastry" .)

I've seen this clue in The Irish Times.

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