Sweet, with hair swept up? (7)
I believe the answer is:
dessert
'sweet' is the definition.
(synonyms)
'with hair swept up?' is the wordplay.
'with' is a charade indicator (letters next to each other).
'hair' becomes 'tress' (tress is a kind of hair).
'swept' becomes 'ed' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'up?' says the letters should be written backwards (in down clue: letters go upwards).
'tress'+'ed' is 'tressed'.
'tressed' reversed gives '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" .)