Crossword Genius

Doesn't describe Thomas? That's for sure! (7,1,5)

Ross

I believe the answer is:

without a doubt

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'sure' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Another definition for without a doubt that I've seen is " Sure".)

I've seen this clue in The Irish Times.
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