Biscuit makes Spooner’s skin hurt (7)

I believe the answer is:

oatcake

'biscuit' is the definition.
(I know that oatcake is a type of Cracker)

I don't understand the rest of the clue.

(Other definitions for oatcake that I've seen before include "Thin biscuit made of ground grain" , "Savoury biscuit" , "Variety of biscuit" , "something like a biscuit" , "Scots biscuit-like food" .)

I've seen this clue in The Guardian.

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