Hideaway in Channel Island, period without technology (9)
I believe the answer is:
hermitage
'hideaway' is the definition.
(thesaurus)
'channel island period without technology' is the wordplay.
'channel island' becomes 'herm' (one of the Channel Islands).
'period' becomes 'age' (age is a kind of period).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'technology' becomes 'it'.
'herm'+'age'='hermage'
'hermage' enclosing 'it' is 'HERMITAGE'.
'in' is the link.
(Other definitions for hermitage that I've seen before include "accommodation for one" , "St Petersburg museum - Rhone wine" , "Museum housing collection started by Catherine the Great" , "Home of a recluse" , "Secluded retreat" .)