Refill (3,2)

I think it could be either:

Which length description are you looking for?:

3,2

top up

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

This is the entire clue.

(Other definitions for top up that I've seen before include "Add a bit more to" , "Extra amount" , "Provide a little more drink" , "Additional amount to restore mobile phone credit, for example" , "Amount for refilling" .)

I've seen this clue in The Guardian, The Telegraph and the Evening Standard.

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