Hard-working (9)

I think it could be either:

Which length description are you looking for?:

assiduous

'hard-working' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for assiduous that I've seen before include "Showing great care and perseverance" , "Persevering" , "Hard-working" , "Marked by care and persistent effort" , "Diligent" .)

I've seen this clue in The Mirror.

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