Crossword Genius

Intervenes on the flight approaching it? (5,2)

Ross

I believe the answer is:

steps in

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'intervenes' is the definition.
('step in' can be a synonym of 'intervene')

I don't understand the remainder of the clue.

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(Other definitions for steps in that I've seen before include "Takes over" , "Intervenes" .)

I've seen this clue in the Evening Standard.
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