Sit awkwardly in breeze, becoming upset (10)
I believe the answer is:
distraught
'upset' is the definition.
(thesaurus)
'sit awkwardly in breeze' is the wordplay.
'awkwardly' indicates anagramming the letters.
'in' is an insertion indicator.
'breeze' becomes 'draught' (I have seen 'Indoor breeze ' mean 'draught' so perhaps 'breeze' could also mean 'draught').
'sit' with letters rearranged gives 'ist'.
'ist' inserted within 'draught' is 'DISTRAUGHT'.
'becoming' is the link.
(Other definitions for distraught that I've seen before include "wild" , "Beside oneself" , "crazy" , "in a state" , "Deeply agitated" .)