Learn dances to an organ (5)
I believe the answer is:
renal
'to an organ' is the definition.
(renal means relating to the kidneys)
'learn dances' is the wordplay.
'dances' indicates an anagram.
'learn' anagrammed gives 'RENAL'.
(Other definitions for renal that I've seen before include "connected with organ" , "Learn (anag) - of organs of the body" , "associated with organ" , "around the kidney" , "Pertaining to the kidneys" .)