Sweet, with hair swept up? (7)
I believe the answer is:
dessert
'sweet' is the definition.
(I know that sweet can be written as dessert)
'with hair swept up?' is the wordplay.
'with' says to put letters next to each other.
'hair' becomes 'tress' (tress is a kind of hair).
'swept' becomes 'ed' (I can't explain this - if you can you should give a lot more credence to this answer).
'up?' says the letters should be written in reverse (in down clue: letters go upwards).
'tress' put next to 'ed' is 'tressed'.
'tressed' backwards is 'DESSERT'.
Can you help me to learn more?
(Other definitions for dessert that I've seen before include "Pudding, sweet" , "Spotted Dick is one" , "Sweet, afters" , "tart?" , "Charlotte maybe" .)