Piece of music from wassailer on doorstep (5)
I believe the answer is:
rondo
'piece of music' is the definition.
(I've seen this before)
'from wassailer on doorstep' is the wordplay.
'from' says the answer is hidden in the clue.
'RONDO' is hidden in the letters of 'wassailer on doorstep'.
(Other definitions for rondo that I've seen before include "Musical piece with a recurring theme" , "Musical form with recurring theme" , "Piece written" , "Musical composition with a recurring theme" , "part of a sonata" .)