Look at country's source of energy (6)
I believe the answer is:
peruse
'look at' is the definition.
(perusing is a kind of looking at)
'country's source of energy' is the wordplay.
'country' becomes 'peru' (Peru is an example).
'source of energy' becomes 'se' (I can't justify this - if you can you should believe this answer much more).
'peru'+'se'='PERUSE'
Can you help me to learn more?
(Other definitions for peruse that I've seen before include "Scrutinize" , "Run one's eye over" , "Browse, read casually" , "Examine at length" , "Thoroughly examine" .)