Dance teacher pirouettes after second piece from Ravel (6)
I believe the answer is:
morris
'dance' is the definition.
(Morris dancing)
'teacher pirouettes after second piece from ravel' is the wordplay.
'teacher' becomes 'sir' (way of addressing a male teacher).
'pirouettes' says the letters should be written in reverse (pirouette is a spin in ballet).
'after' means one lot of letters go next to another.
'second' becomes 'mo' (both are short periods of time).
'piece from ravel' becomes 'r' (I can't justify this - if you can you should give a lot more credence to this answer).
'sir' back-to-front is 'ris'.
'mo'+'r'='mor'
'ris' put after 'mor' is 'MORRIS'.
Can you help me to learn more?
(Other definitions for morris that I've seen before include "William -, nineteenth century English craftsman and writer" , "William --, English designer and novelist" , "Old English dance" , "William --, artist and author" , "19th-century designer" .)