Provide only a version

I think it could be either:

Which length description are you looking for?:

3,2

layon

'provide' is the definition.
(I've seen this before)

'only a version' is the wordplay.
'version' indicates an anagram.
'only'+'a'='onlya'
'onlya' anagrammed gives 'LAY ON'.

I've seen this clue in the Evening Standard.

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