Brags (6)
I believe the answer is:
boasts
'brags' is the definition.
('boast' can be a synonym of 'brag')
This is all the clue.
(Other definitions for boasts that I've seen before include "Blows one's own trumpet" , "Brags, shows off" , "crows" , "Brags in praise of oneself" , "Brags, blows" .)