Slumbering (8)

I think it could be either:

Which length description are you looking for?:

sleeping

'slumbering' is the definition.
('sleep' can be a synonym of 'slumber')

This is the entire clue.

(Other definitions for sleeping that I've seen before include "In the land of Nod" , "Dormant" .)

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

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