Reversal of routine important for country (6)
I believe the answer is:
turkey
'country' is the definition.
(Turkey is an example)
'reversal of routine important' is the wordplay.
'reversal of' shows that the letters should be reversed in order.
'routine' becomes 'rut' (rut is a kind of routine).
'important' becomes 'key' ('key' can be similar in meaning to 'important').
'rut' back-to-front is 'tur'.
'tur'+'key'='TURKEY'
'for' acts as a link.
(Other definitions for turkey that I've seen before include "Part of the Christmas meal" , "hill-dwelling MC in 3 9 [THE OWL AND THE PUSSY-CAT]" , "See 12" , "Its capital is Ankara" , "Mostly Asian country" .)