10 across
Pythagoras
selectively
doing
his
shopping
here?
(5)
Pythagoras selectively doing his shopping here? (5)
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The whole clue is the definition (& lit or double definition).
How the clue works
The whole clue works as an &lit — an agora being the Greek marketplace where Pythagoras might indeed have done his shopping. At the same time, 'selectively' signals that the answer is hidden inside PythAGORAs, and there it is, hiding in plain sight.