Tour has upset writers (7)
I believe the answer is:
authors
'writers' is the definition.
('author' can be a synonym of 'writer')
'tour has upset' is the wordplay.
'upset' indicates an anagram.
'tour'+'has'='tourhas'
'tourhas' is an anagram of 'AUTHORS'.
(Other definitions for authors that I've seen before include "Writers, generators" , "People who write" , "Pens" , "Writers, originators" , "Writes" .)