Talk informally (4)

I think it could be either:

Which length description are you looking for?:

chat

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

This is all the clue.

(Other definitions for chat that I've seen before include "Tom in 22 [ALSACE]" , "Talk familiarly" , "Friendly talk" , "A bird; converse" , "An inconsequential and informal talk" .)

I've seen this clue in the Evening Standard and The Times.

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