Sausage roll made at Barking (10)

I believe the answer is:

mortadella

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

'roll made at barking' is the wordplay.
'barking' is an anagram indicator ('barking' can informally mean mad).
'roll'+'made'+'at'='rollmadeat'
'rollmadeat' anagrammed gives 'MORTADELLA'.

(Another definition for mortadella that I've seen is " Sausage".)

I've seen this clue in The Independent and The Guardian.

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