Strong and energetic (8)

I think it could be either:

Which length description are you looking for?:

vigorous

'strong and energetic' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for vigorous that I've seen before include "Full of energy and strength" , "Strong, healthy" , "Powerful, energetic" , "Energetic, forceful" , "Strong and energetic" .)

I've seen this clue in The Irish Times.

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