Criminal to leave country (5)
I believe the answer is:
congo
'country' is the definition.
(Congo is an example)
'criminal to leave' is the wordplay.
'criminal' becomes 'con' (abbreviation for 'convict').
'to' is a charade indicator (letters next to each other).
'leave' becomes 'go'.
'con'+'go'='CONGO'
(Other definitions for congo that I've seen before include "Wide river" , "Major central African river" , "Region of central Africa" , "Brazzaville its capital" , "Central African country" .)