High priest of soul maybe told about dancing (13)
I believe the answer is:
Here is my best explanation:
'about dancing' is the definition.
'high priest of soul maybe told' is the subsidiary indication.
I cannot quite see how this works, but
an anagram of 'priest' is 'terpsi' which is present in the answer.
'of' could be 'o' and 'o' is present in the answer.
This explanation may well be incorrect...
(Other definitions for terpsichorean that I've seen before include "become a dancer", "of dance numbers", "Dancing", "Related to dancing - chain store rep (anag)", "Dancer", "Relating to dancing" and "Of dance".)