Official was disheartened with trade changes (7)
I believe the answer is:
'official' is the definition.
(I know that steward is a type of official)
'was disheartened with trade changes' is the wordplay.
'disheartened' says to hollow out the word (remove centre letters).
'with' is a charade indicator (letters next to each other).
'changes' indicates anagramming the letters.
'was' with its middle taken out is 'ws'.
'ws' after 'trade' is 'tradews'.
'tradews' is an anagram of 'STEWARD'.
(Other definitions for steward that I've seen before include "Shipboard attendant" , "bailiff" , "Racing official" , "Flight attendant" , "Overseer" .)