By far (6)

I think it could be either:

Which length description are you looking for?:

3,3,4

easily

'by far' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for easily that I've seen before include "without a hitch?" , "Very probably" , "without doubt" , "Comfortably" , "Without much difficulty" .)

I've seen this clue in The Mirror and the Evening Standard.

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