Change examination to accommodate current leader (9)
I believe the answer is:
editorial
'leader' is the definition.
(I've seen this before)
'change examination to accommodate current' is the wordplay.
'change' becomes 'edit' (editing is a kind of changing**).
'examination' becomes 'oral' (oral is a kind of examination).
'to accommodate' means one lot of letters goes inside another.
'current' becomes 'i' (symbol for electric current).
'oral' placed around 'i' is 'orial'.
'edit'+'orial'='EDITORIAL'
(Other definitions for editorial that I've seen before include "bit of paper" , "Statement of a newspaper's opinion" , "considered view on paper" , "Newspaper opinion piece" , "Article written" .)