Chess piece and member of the clergy (6)
I believe the answer is:
bishop
'chess piece and member of the clergy' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bishop that I've seen before include "that, moving, must abandon his rank" , "Chess piece and senior religious person" , "Senior churchman" , "whose moves cut across the rank and file" , "Church dignitary" .)