Auspicious (10)

I think it could be either:

Which length description are you looking for?:

promising

'auspicious' is the definition.
(similar in meaning)

This is all the clue.

(Other definitions for promising that I've seen before include "Favourable -- hopeful" , "Giving one's word" , "Showing great potential" , "Encouraging" .)

I've seen this clue in The Guardian.

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