Reshuffle of cabinet role for party (11)
I believe the answer is:
celebration
'for party' is the definition.
(I've seen this before)
'reshuffle of cabinet role' is the wordplay.
'reshuffle of' is an anagram indicator (I've seen 'reshuffled' mean this).
'cabinet'+'role'='cabinetrole'
'cabinetrole' is an anagram of 'CELEBRATION'.
(Other definitions for celebration that I've seen before include "The marking of a significant event" , "Revelry" , "Festival" , "Party" , "Festive honouring" .)