Order to include Channel Islands event (8)
I believe the answer is:
incident
'event' is the definition.
(incident is a kind of event)
'order to include channel islands' is the wordplay.
'order' becomes 'indent' (indent is a kind of order).
'to include' means one lot of letters goes inside another.
'channel islands' becomes 'ci'.
'indent' going around 'ci' is 'INCIDENT'.
(Other definitions for incident that I've seen before include "Mishap - occurrence" , "is liable to occur" , "Public disturbance" , "Event, occurence" , "Episode" .)