Crossword Genius

One on flight to look hard when speaking (5)

Ross

I believe the answer is:

stair

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

'look hard when speaking' is the wordplay.
'look hard' becomes 'stare' (I've seen this before).
'when speaking' shows a homophone (sound like).
'stare' sounds like 'STAIR'.

'to' is the link.

(Other definitions for stair that I've seen before include "Step as part of flight" , "A step on the way up or down" , "single step in a series" , "means to go down" , "One step in a series" .)

I've seen this clue in The Times.
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