Performance in Oslo rescheduled (4)
I believe the answer is:
solo
'performance' is the definition.
(I know that solo is a type of performance)
'oslo rescheduled' is the wordplay.
'rescheduled' indicates an anagram (I've seen 'rescheduling' mean this (I've seen this in other clues)).
'oslo' is an anagram of 'SOLO'.
'in' acts as a link.
(Other definitions for solo that I've seen before include "Type of whist" , "Aline in Oslo" , "Unaccompanied flight" , "Lone" , "By oneself" .)