Conventional, usual (6)
I believe the answer is:
normal
This clue is a double definition.
'conventional' is the first definition.
(I've seen this in another clue)
'usual' is the second definition.
(I've seen this in another clue)
(Other definitions for normal that I've seen before include "Standard - well-adjusted" , "Ordinary, usual" , "Ordinary, not unusual" , "Run-of-the-mill" , "Usual, not extraordinary" .)