Rough-sounding dessert? (6)
I believe the answer is:
course
'dessert?' is the definition.
(dessert is a kind of course)
'rough-sounding' is the wordplay.
'rough' becomes 'coarse' (associated in meaning).
'sounding' shows a homophone (sound like).
'coarse' sounds like 'COURSE'.
(Other definitions for course that I've seen before include "way" , "Part of a meal or a series of lessons" , "Prescribed number of lessons" , "Channel" , "Source (anag.)" .)