Study country’s Article 50 (7)

I believe the answer is:

perusal

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'study' is the definition.
(thesaurus)

'country's article 50' is the wordplay.
'country' becomes 'peru' (Peru is an example).
'article 50' becomes 'sal' (I am not sure about this - if you are sure you should believe this answer much more).
'peru'+'sal'='PERUSAL'

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(Other definitions for perusal that I've seen before include "Inspection" , "Thorough read-through" , "Careful look" , "Scanning, reading" , "Thorough reading" .)

I've seen this clue in The Times.

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