State TV channel back in North Korea at last (6)
I believe the answer is:
nevada
'state' is the definition.
(Nevada is an example)
'tv channel back in north korea at last' is the wordplay.
'tv channel' becomes 'Dave' (UK TV channel).
'back' suggests the final letters (I've seen 'back of' mean this).
'north' says the letters should be written in reverse (in a down clue, letters go up or 'northward').
'at last' says to take the final letters.
The last letter of 'in' is 'n'.
The last letter of 'korea' is 'a'.
'dave'+'n'='daven'
'daven' in reverse letter order is 'nevad'.
'nevad'+'a'='NEVADA'
(Other definitions for nevada that I've seen before include "US desert state" , "part of US" , "Curiously, Dan and Eva are in the US" , "Arid US state" , "American state, capital Carson City" .)