Junior minister to organise exhibitions (6)
I believe the answer is:
curate
This clue is a double definition.
'junior minister' is the first definition.
'organise exhibitions' is the second definition.
'to' acts as a link.
(Other definitions for curate that I've seen before include "Member of the clergy" , "Acuter (anag.)" , "Organize a museum or exhibition" , "Junior church minister" , "Priest, a vicar's assistant" .)