11 across
Old
banger
taking
the
biscuit
with
breakdown
truck,
would
you
say?
(8)
Old banger taking the biscuit with breakdown truck, would you say? (8)
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The definition is at the beginning of the clue.
How the clue works
Look at Old banger — that's your definition, pointing to the famous exploding volcano. "Would you say?" is your homophone signal, so you need sounds-like wordplay: taking the biscuit gives you "cracker," and breakdown truck gives you "tower" (a truck that tows), and "cracker" plus "tower" said aloud gets you there.