What formal debaters do to be logical (5,2,6)

I believe the answer is:

stand to reason

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'be logical' is the definition.
(I've seen this in another clue)

'what formal debaters do to' is the wordplay.
I cannot quite understand how this works, but
'to' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for stand to reason that I've seen is " make sense".)

I've seen this clue in The Globe and Mail.

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