Enjoy ballet every so often, being aristocratic (5)
I believe the answer is:
noble
'aristocratic' is the definition.
('noble' is associated in meaning with 'aristocratic')
'enjoy ballet every so often' is the wordplay.
'every so often' indicates alternate letters.
'enjoy'+'ballet'='enjoyballet'
The alternate letters of 'enjoyballet' are 'NOBLE'.
'being' is the link.
(Other definitions for noble that I've seen before include "gold coin, now obsolete" , "Impressive in appearance" , "Honourable ? aristocratic" , "August" , "Having high moral qualities" .)