Is tight-lipped (5,2)

I think it could be either:

Which length description are you looking for?:

5,2

clams up

'is tight-lipped' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for clams up that I've seen before include "Is mum" , "Refuses to talk" , "abruptly stops talking" .)

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