27 across
Arsenal’s
feeble
passing
through
channel
(9)
Arsenal’s feeble passing through channel (9)
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The definition is at the beginning of the clue.
How the clue works
Look at Arsenal's — that's your definition, pointing to a store of weapons rather than the football club. You take ARTERY, meaning channel, and slot ILL (feeble) inside it, giving you ART-ILL-ERY.