Scan for every country left (7)
I believe the answer is:
perusal
'scan' is the definition.
(I have seen 'thorough scan' mean 'perusal' so perhaps 'scan' could also mean 'perusal')
'every country left' is the wordplay.
'every' becomes 'per' (I've seen this in other clues).
'country' becomes 'usa' (USA is an example).
'left' becomes 'l' (common abbreviation).
'per'+'usa'+'l'='PERUSAL'
'for' acts as a link.
(Other definitions for perusal that I've seen before include "Process of examination" , "Thorough reading" , "Careful examination" , "Thorough read-through" , "Study or scrutiny" .)