Land of the man in grey, perhaps (7)
I believe the answer is:
germany
'land' is the definition.
(I know that Germany is a land)
'man in grey perhaps' is the wordplay.
'in' is an insertion indicator.
'perhaps' is an anagram indicator.
'grey' anagrammed gives 'gery'.
'man' placed inside 'gery' is 'GERMANY'.
'of the' acts as a link.
(Other definitions for germany that I've seen before include "EU member" , "Mary, gen up on the country" , "European nation" , "Central European country" , "European federal republic" .)