In Channel Islands, get impression of event (8)
I believe the answer is:
incident
'event' is the definition.
(incident is a kind of event)
'in channel islands get impression' is the wordplay.
'channel islands' becomes 'ci'.
'get' means one lot of letters go next to another.
'impression' becomes 'dent' (dent is a kind of impression).
'in'+'ci'+'dent'='INCIDENT'
'of' is the link.
(Other definitions for incident that I've seen before include "Public disturbance" , "hostile clash" , "Event, occurence" , "Mishap - occurrence" , "Falling" .)