Compelled to take rook for bishop in game (5)
I believe the answer is:
round
'game' is the definition.
(round is a kind of game)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for round that I've seen before include "unsuitable for square pegs" , "Set of drinks; song" , "Drinks order" , "A partsong in which voices follow each other" , "Encircling" .)