8 across
Turner
on
The
Hay
Wain?
(5)
Turner on The Hay Wain? (5)
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The whole clue is the definition (& lit or double definition).
How the clue works
The whole clue works as a cryptic definition: a wheel is something that turns, and a hay wain (a hay wagon) runs on wheels. The question mark is there to nudge you toward Turner the painter and Constable's famous canvas — a cheeky bit of misdirection.