Country market — detailed study (7)
I believe the answer is:
perusal
'study' is the definition.
(I've seen this before)
'country market detailed' is the wordplay.
'country' becomes 'peru' (Peru is an example).
'market' becomes 'sale' (I've seen this in other clues).
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'sale' with its final letter taken away is 'sal'.
'peru'+'sal'='PERUSAL'
(Other definitions for perusal that I've seen before include "Careful reading" , "A casual read or study" , "Careful look" , "Scanning, reading" , "Reading, examination" .)