Look at Channel Islands places (4)
I believe the answer is:
loci
'places' is the definition.
(I've seen this before)
'look at channel islands' is the wordplay.
'look' becomes 'lo' (archaic exclamation meaning 'look!').
'at' says to put letters next to each other.
'channel islands' becomes 'CI'.
'lo'+'ci'='LOCI'
(Other definitions for loci that I've seen before include "locations" , "Particular places" , "Points where something occurs; coil (anag.)" , "sites" , "Particular positions" .)