Crossword Genius

Green light seen in space (9)

Ross

I believe the answer is:

clearance

I believe this clue is a double definition.

'green light' is the first definition.
(I've seen this in another clue)

'space' is the second definition.
(I know that clearance is a type of space)

'seen in' acts as a link.

(Other definitions for clearance that I've seen before include "Sanction" , "Headroom" , "Intervening space" , "Authority" , "Eviction from lands" .)

I've seen this clue in The Times.
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