A comprehensive in another country (6)
I believe the answer is:
abroad
'another country' is the definition.
(I've seen this before)
'a comprehensive' is the wordplay.
'comprehensive' becomes 'broad' (similar in meaning).
'a'+'broad'='ABROAD'
'in' is the link.
(Other definitions for abroad that I've seen before include "in Paris, perhaps" , "In a foreign country" , "over a wide area" , "Out of doors - in foreign parts" , "In foreign land" .)