Slow song from fancy dance promo (6)
I believe the answer is:
ballad
'slow song' is the definition.
'ballad' can be an answer for 'song' (ballad is a kind of song). I am not sure about the 'slow' bit.
'fancy dance promo' is the wordplay.
'fancy dance' becomes 'ball' (I've seen this in another clue).
'promo' becomes 'ad' (I can't explain this - if you can you should believe this answer much more).
'ball'+'ad'='BALLAD'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for ballad that I've seen before include "Form of verse" , "Simple song or poem" , "Narrative song with a recurrent refrain" , "Narrative poem or song" , "Folk song" .)