Elegant bird with King at the end of party (6)
I believe the answer is:
swanky
'elegant' is the definition.
(similar in meaning)
'bird with king at the end of party' is the wordplay.
'bird' becomes 'swan' (swan is a kind of bird).
'with' says to put letters next to each other.
'king' becomes 'K' (abbreviation for king in chess).
'at the end of' says to take the final letters.
The final letter of 'party' is 'y'.
'swan'+'k'+'y'='SWANKY'
(Other definitions for swanky that I've seen before include "Swish" , "glamorous" , "Ostentatious" , "Ostentatiously smart" , "Posh" .)