Twice-aged mixed with senior ballet artist (5,5)

'twice-aged mixed with senior ballet artist' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'twice-aged mixed with senior ballet artist' is the wordplay.
I cannot really see how this works, but
an anagram of 'aged' is 'edga' which is within the answer.
'artist' could be 'degas' (painter Edgar Degas) and 'degas' is present in the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?