Possible Clues:

• Piece, if black may be red
• Bishop, for one, whose position is determined by rank and file
• Church crudely means to suppress second bishop?
• Musical chap that's played on board
• Castle for grand master perhaps
• A board member, he's entertained by Civil Service staff
• Knight or bishop
• Nazi male in prison — perhaps a castle?
• Revolutionary guards work for king, say
• Eg, bishop or rook