Unit of capacity (5)

I think it could be either:

Which length description are you looking for?:

litre

'unit of capacity' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for litre that I've seen before include "A pint or two" , "Metric measure of capacity" , "Measure of liquid volume" , "1.7598 UK pints" , "Unit of liquid measure" .)

I've seen this clue in The Telegraph and the Sydney Morning Herald.

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