Crossword Genius

Contractor's confirmation? (3)

Ross

I believe the answer is:

tis

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But I can't explain it at all! Could you help me understand?

(Other definitions for tis that I've seen before include "That thing's" , "I confirm the identity of" , "Sequel to "Angela's Ashes"" , "McCourt work" , "For poet, that's" .)

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