Losing power, call Hebridean destination (4)
I believe the answer is:
skye
'hebridean destination' is the definition.
(Hebridean Island)
'losing power call' is the wordplay.
'losing' suggests deleting specific letters.
'power' becomes 'p'.
'call' becomes 'skype' (to Skype is to videocall on Skype).
'skype' with 'p' removed is 'SKYE'.
(Other definitions for skye that I've seen before include "Hebridean island close to mainland" , "Island in a boat song about Flora MacDonald and Bonnie Prince Charlie" , "Scots isle" , "Scottish location" , "somewhere off Scotland's west coast" .)