Average, ordinary (6)
I believe the answer is:
normal
I believe this clue is a double definition.
'average' is the first definition.
(synonyms)
'ordinary' is the second definition.
(I've seen this before)
(Other definitions for normal that I've seen before include "Commonplace" , "Run-of-the-mill" , "Conforming to a standard" , "Standard; at right angles" , "Popular" .)