Revolution engulfing a country (5)
I believe the answer is:
spain
'country' is the definition.
(Spain is an example)
'revolution engulfing a' is the wordplay.
'revolution' becomes 'spin' (spin is a kind of revolution).
'engulfing' indicates putting letters inside.
'spin' placed around 'a' is 'SPAIN'.
(Other definitions for spain that I've seen before include "Madrid is its capital" , "Iberian 4" , "Iberian country" , "Pains badly to be in the country" , "ditto" .)