Crossword Genius

Time, to a physicist (6,9)

Ross

I believe the answer is:

fourth dimension

'time to a physicist' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for fourth dimension that I've seen before include "It may be described as time" , "feature of spacetime" .)

I've seen this clue in the USA Today.
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