Ravine enclosing English king (6)
I believe the answer is:
george
'king' is the definition.
(eg King George VI)
'ravine enclosing english' is the wordplay.
'ravine' becomes 'gorge' (gorge is a kind of ravine).
'enclosing' is an insertion indicator.
'english' becomes 'e' (abbreviation).
'gorge' going around 'e' is 'GEORGE'.
(Other definitions for george that I've seen before include "Boy's name" , "people swear by" , "Boy --; -- Clooney" , "The G in G. B. Shaw" , "Man's name" .)