Tour with Bake Off possibly rash (8)
I believe the answer is:
outbreak
'rash' is the definition.
(outbreak can mean a rash or flare-up)
'tour with bake off' is the wordplay.
'with' is a charade indicator (letters next to each other).
'off' indicates an anagram.
'tour' put after 'bake' is 'baketour'.
'baketour' is an anagram of 'OUTBREAK'.
'possibly' acts as a link.
(Other definitions for outbreak that I've seen before include "disturbance" , "Sudden occurrence (of war, disease, etc.)" , "Violent occurrence" , "rash" , "Sudden spontaneous occurrence" .)