Great in number (6)

I think it could be either:

Which length description are you looking for?:

legion

'great in number' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for legion that I've seen before include "Host" , "Large unit of the old Roman army" , "Roman military formation" , "Many soldiers" , "Roman military body of men" .)

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

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