Country rebels urge mob to support illuminating measure (10)
I believe the answer is:
luxembourg
'country' is the definition.
(Luxembourg is an example)
'rebels urge mob to support illuminating measure' is the wordplay.
'rebels' indicates anagramming the letters.
'to support' means one lot of letters go next to another (in a down clue, some letters hold others up).
'illuminating measure' becomes 'lux' (lux is a kind of measure. I am not sure about the 'illuminating' bit.).
'urge'+'mob'='urgemob'
'urgemob' anagrammed gives 'embourg'.
'embourg' put after 'lux' is 'LUXEMBOURG'.
Can you help me to learn more?
(Other definitions for luxembourg that I've seen before include "EU member" , "Land" , "Small European country" .)