Redundant (6)
I believe the answer is:
otiose
'redundant' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for otiose that I've seen before include "Laze, idle" , "Disinclined to work or exert oneself" , "Serving no practical purpose" , "Indolent, ineffectual" , "O so tie up and be vain and empty" .)