Lack of originality (9)
I believe the answer is:
triteness
'lack of originality' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for triteness that I've seen before include "dullness" , "Interests (anag.)" , "Interests in the commonplace" , "Interests of some staleness" , "Unoriginality" .)