Crossword Genius

Having tantrums on retreat, one in flight (4)

Ross

I believe the answer is:

step

'one in flight' is the definition.
(part of a flight of stairs)

I cannot understand how the rest of the clue works.

(Other definitions for step that I've seen before include "bit of a dance" , "Place foot on as with a pest" , "Football" , "A pace for pets" , "Gradation" .)

I've seen this clue in The Times.
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