Crossword Genius

Step sibling's first tear, we hear (5)

Ross

I believe the answer is:

stair

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'step' is the definition.
(a single step in a staircase)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for stair that I've seen before include "section of flight" , "One step of a flight" , "One of a 15" , "Rising step" , "single step in a series" .)

I've seen this clue in The Daily Express.
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