Puddings I'd sent back, upset (10)
I believe the answer is:
distressed
'upset' is the definition.
(thesaurus)
'puddings i'd sent back' is the wordplay.
'puddings' becomes 'desserts' (I've seen this before).
'sent back' says the letters should be written in reverse.
'desserts'+'id'='dessertsid'
'dessertsid' reversed gives 'DISTRESSED'.
(Other definitions for distressed that I've seen before include "in anguish?" , "like Samson when deprived of his strength?" , "Upset; deliberately aged" , "Anxious" , "In deep pain or sorrow" .)