24 across
River,
one
under
Wimbledon
Common?
(7)
River, one under Wimbledon Common? (7)
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The whole clue is the definition (& lit or double definition).
How the clue works
River gives you the geographical definition — the Orinoco in South America. But there's a cheeky second definition tucked in: one under Wimbledon Common? is pointing at the Wombles, those fictional creatures who famously live under Wimbledon Common, and Orinoco is one of them.