Mundane or dull (7)
I believe the answer is:
prosaic
This clue is a double definition.
'mundane' is the first definition.
(I've seen this in another clue)
'dull' is the second definition.
(similar in meaning)
(Other definitions for prosaic that I've seen before include "Hackneyed" , "flat" , "Humdrum" , "Non-poetic, unromantic" , "Dull (writing)" .)