Braggart again has come dancing (9)
I believe the answer is:
egomaniac
'braggart' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'again has come dancing' is the wordplay.
'has' says to put letters next to each other.
'dancing' indicates anagramming the letters.
'again' after 'come' is 'comeagain'.
'comeagain' is an anagram of 'EGOMANIAC'.
Can you help me to learn more?
(Other definitions for egomaniac that I've seen before include "Obsessively self-centred person" , "Oneself, one would love" , "One who's self-obsessed" , "Highly self-absorbed person" , "who's full of himself" .)