Dim part of notable arena (5)
I believe the answer is:
blear
'dim' is the definition.
(I've seen this before)
'part of notable arena' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'BLEAR' is hidden in the letters of 'notable arena'.
(Other definitions for blear that I've seen before include "Blur" , "Indistinct" , "Watery, blurred" , "Make (the eyes) dim" , "Baler (anag.)" .)