A minor revolutionary leading a nation (7)
I believe the answer is:
romania
'nation' is the definition.
(Romania is an example)
'a minor revolutionary leading a' is the wordplay.
'revolutionary' is an anagram indicator.
'leading' means one lot of letters go next to another.
'a'+'minor'='aminor'
'aminor' is an anagram of 'romani'.
'romani'+'a'='ROMANIA'
(Other definitions for romania that I've seen before include "Balkan country" , "European republic" , "East European country" , "Country of eastern Europe" , "Oman air in the eastern European state" .)