Capital that is raised comes through British channel (6)
I believe the answer is:
beirut
'capital' is the definition.
(Beirut is an example)
'that is raised comes through british channel' is the wordplay.
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'raised' shows that the letters should be reversed in order.
'comes through' means one lot of letters goes inside another.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'channel' becomes 'rut' (I've seen this before).
'ie' in reverse letter order is 'ei'.
'b'+'rut'='brut'
'ei' going within 'brut' is 'BEIRUT'.
(Other definitions for beirut that I've seen before include "Middle East capital" , "Capital city of Lebanon" , "Lebanese capital" , "Capital of 21 across" , "Lebanon's capital" .)