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They're vegetable, and one may be found in pies (7)

Ross

I believe the answer is:

peonies

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'they're vegetable' is the definition.
The definition suggests an adverb but the answer is not.

'one may be found in pies' is the wordplay.
'may be' indicates an anagram.
'found in' indicates putting letters inside.
'one' is an anagram of 'eon'.
'eon' inserted within 'pies' is 'PEONIES'.

'and' acts as a link.

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I've seen this clue in the Evening Standard.
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