Goes if upset by old-fashioned people (6)
I believe the answer is:
fogies
'old-fashioned people' is the definition.
(I've seen this before)
'goes if upset' is the wordplay.
'upset' is an anagram indicator.
'goes'+'if'='goesif'
'goesif' is an anagram of 'FOGIES'.
'by' acts as a link.
(Other definitions for fogies that I've seen before include "Old-fashioned people" , "Old . . . . . . are men with dated ideas" , "Old . . . . . . are men with old-fashioned ideas" , "Their old styles are out of fashion" .)