Does wish to change to a subordinate event (8)
I believe the answer is:
sideshow
'a subordinate event' is the definition.
(I've seen this before)
'does wish to change' is the wordplay.
'to change' indicates an anagram.
'does'+'wish'='doeswish'
'doeswish' is an anagram of 'SIDESHOW'.
'to' is the link.
(Other definitions for sideshow that I've seen before include "Not the main scene of activity" , "Minor display adjacent to a larger one" , "Unimportant" , "Exhibition subordinate to a larger one" , "Minor but diverting incident" .)