Bangers in sack with bananas (12)

I believe the answer is:

firecrackers

'bangers' is the definition.
('firecracker' can be a synonym of 'banger')

'sack with bananas' is the wordplay.
'sack' becomes 'fire' (synonyms).
'with' says to put letters next to each other.
'bananas' becomes 'crackers' (both can informally mean mad).
'fire'+'crackers'='FIRECRACKERS'

'in' acts as a link.

I've seen this clue in The Times.

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