Apart from a dessert that was sent back (5)
I believe the answer is:
aloof
'apart from' is the definition.
(I've seen this before)
'a dessert that was sent back' is the wordplay.
'a dessert' becomes 'fool' (type of dessert).
'that was' becomes 'a' (I can't justify this - if you can you should give a lot more credence to this answer).
'sent back' says the letters should be written backwards.
'fool'+'a'='foola'
'foola' reversed gives 'ALOOF'.
Can you help me to learn more?
(Other definitions for aloof that I've seen before include "Distant or stuck-up" , "apart from all else" , "Unpleasantly cold" , "Haughty and distant like a fool" , "Remote, distant" .)