Sort of stop exchanging rook for bishop: what's left for you? (7)
I believe the answer is:
bequest
'sort' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for bequest that I've seen before include "One left in will" , "Something gifted in a will" , "Gift left in will" , "Endowment, legacy" , "Something left in a will (7)" .)