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Domestic
flight
(9)
Domestic flight (9)
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The whole clue is the definition (& lit or double definition).
How the clue works
Nice one, this whole clue is just one cheeky definition — Domestic flight is playing on "flight" meaning not an aircraft journey but a flight of stairs in your own house. So a staircase is just a domestic (household) flight of steps, hiding in plain sight.