Reservoir (4)

I think it could be either:

Which length description are you looking for?:

tank

'reservoir' is the definition.
(source of water)

This is the entire clue.

(Other definitions for tank that I've seen before include "Large storage chamber" , "defeat" , "Offensive vehicle" , "Armoured vehicle - container for liquid or gas" , "Storage chamber; drink heavily (colloq.)" .)

I've seen this clue in The Telegraph and The Mirror.

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