A gentle eccentric, dignified and graceful (7)
I believe the answer is:
elegant
'dignified and graceful' is the definition.
(both can mean elegant)
'a gentle eccentric' is the wordplay.
'eccentric' indicates anagramming the letters.
'a'+'gentle'='agentle'
'agentle' with letters rearranged gives 'ELEGANT'.
(Other definitions for elegant that I've seen before include "Modish" , "Graceful - refined" , "Well-turned" , "luxurious style?" , "A gentle sort of stylish appearance" .)