Made certain king gets followed around (7)

I believe the answer is:
ensured
'made certain' is the definition.
('ensure' can be a synonym of 'make certain')
'king gets followed around' is the wordplay.
I cannot really see how this works, but
'king' could be 'r' (abbreviation for rex, king in Latin) and 'r' is found in the answer.
'followed' could be 'ensued' (I've seen this in another clue) and 'ensued' is found within the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ensured that I've seen before include "Make certain of" , "Determined" , "guaranteed" , "Made certain for end user" , "Made certain, clinched" .)
