Worked up in fair at Edinburgh (5)
I believe the answer is:
irate
'worked up' is the definition.
(thesaurus)
'in fair at edinburgh' is the wordplay.
'in' indicates a hidden word.
'IRATE' is hidden in the letters of 'fair at edinburgh'.
(Other definitions for irate that I've seen before include "Aggrieved" , "I tear away, being annoyed" , "Angry, enraged" , "A tier (anag)" , "Indignant, angry" .)