Hold water (3,2)

I think it could be either:

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3,2

add up

'hold water' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for add up that I've seen before include "Total; make sense" , "Seem to be sensible" , "Seem consistent or reasonable - arithmetically?" , "Put together (numbers)" , "Do sums" .)

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