Crisp biscuit (5)

I think it could be either:

Which length description are you looking for?:

6,4

wafer

'crisp biscuit' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for wafer that I've seen before include "Light thin biscuit" , "A very thin plain biscuit" , "Ice cream biscuit" , "Very thin slice" , "Ice-cream biscuit" .)

I've seen this clue in The Telegraph and The Mirror.

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