Expression of agreement (5)

I think it could be either:

Which length description are you looking for?:

roger

'expression of agreement' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for roger that I've seen before include "man, > I understand" , "R in telecommunications" , "- - Moore (007)" , "Chap" , "Military 'OK'" .)

I've seen this clue in the Evening Standard.

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