After misdelivery, trousers and note turned up (9)
I believe the answer is:
'turned up' is the definition.
(retrousse describes an attractively turned up nose)
'after misdelivery trousers and note' is the wordplay.
I cannot really understand how this works, but
an anagram of 'trousers' is 'retrouss' which is located in the answer.
'note' could be 'e' (musical note) and 'e' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for retrousse that I've seen before include "(Of noses) upturned" , "Of nose, turned up at tip" , "turned up in Nice" .)