10 across
Briskly
cheerful
person
preparing
potatoes?
(7)
Briskly cheerful person preparing potatoes? (7)
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The whole clue is the definition (& lit or double definition).
How the clue works
The definition is Briskly cheerful, meaning lively and upbeat. But person preparing potatoes? does the same job from the other direction — a chipper being someone who chips potatoes, or just your local chip shop.