Where bid may be beyond doubt (2,6)
I believe the answer is:
in spades
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for in spades that I've seen before include "how a contract may be agreed" , "To a very great degree" , "Decidedly" , "to a large degree" , "Not half!" .)