Tradition for one retiring to country (5)
I believe the answer is:
usage
'tradition' is the definition.
(thesaurus)
'for one retiring to country' is the wordplay.
'for one' becomes 'eg' (I've seen this in other clues).
'retiring' says the letters should be written in reverse.
'to' says to put letters next to each other (I've seen this in other clues).
'country' becomes 'usa' (U.S.A. is an example**).
'eg' backwards is 'ge'.
'ge' after 'usa' is 'USAGE'.
(Other definitions for usage that I've seen before include "Convention" , "Tradition - rate of consumption" , "Acceptable language" , "Way of employing" , "Established custom" .)