Crossword Genius

Deduces that the tour season has been ruined (7,3)

Ross

I believe the answer is:

reasons out

I'm a little stuck... Click here to teach me more about this clue!

'deduces that the tour' is the definition.
I can't judge whether this defines the answer.

'season has been ruined' is the wordplay.
I cannot really see how this works, but
an anagram of 'season' is 'easons' which is present in the answer.
The remaining letters 'rout' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

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