Right; conventional (6)
I believe the answer is:
proper
I believe this clue is a double definition.
'right' is the first definition.
(I know that right can be written as proper)
'conventional' is the second definition.
(I've seen this before)
(Other definitions for proper that I've seen before include "Correct in behaviour" , "Genuine; respectable" , "Refined" , "Genuine; suitable" , "part of Mass" .)