Bottoms up! (6)

I think it could be either:

Which length description are you looking for?:

4,3,5

cheers

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

This is all the clue.

(Other definitions for cheers that I've seen before include "Heartens with hurrahs" , "Praises < eggs on" , "Encouragement" , "Ta - ta-ta" , "Hurrahs and oles" .)

I've seen this clue in The Independent.

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