Boasting - a lion's vigour? (anag) (12)

I believe the answer is:

vainglorious

(Other definitions for vainglorious that I've seen before include "Boastful; rousing viola (anag.)" , "Egotistic" , "Excessively self-proud" , "Self-important -- savouring oil (anag)" , "Overly self-regarding" .)

I've seen this clue in The Guardian.

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