Splendid, splendid bishop (6)
I believe the answer is:
superb
'splendid' is the definition.
(both can mean excellent)
'splendid bishop' is the wordplay.
'splendid' becomes 'super' (I've seen this before).
'bishop' becomes 'B' (chess abbreviation).
'super'+'b'='SUPERB'
(Other definitions for superb that I've seen before include "Wonderful, really great" , "First-rate" , "First-class" , "Outstandingly excellent" , "choice" .)