Cooked spider crab, brittle foodstuff (10)

I believe the answer is:

crispbread

I'm a little stuck... Click here to teach me more about this clue!

'brittle foodstuff' is the definition.
The definition suggests a singular noun which matches the answer.

'cooked spider crab' is the wordplay.
'cooked' is an anagram indicator (letters cooked into a new form).
'spider'+'crab'='spidercrab'
'spidercrab' anagrammed gives 'CRISPBREAD'.

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I've seen this clue in The Everyman puzzle in The Observer.

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