Crossword Genius

In the past, at this straightaway (4)

Ross

I believe the answer is:

once

I believe this is a double definition.

'in the past' is the first definition.
(once upon a time)

'at this straightaway' is the second definition.
('at once' means straightaway)

(Other definitions for once that I've seen before include "One-time - one time" , "Quick examination" , "In former times" , "... upon a time for the storyteller" , "In the old days" .)

I've seen this clue in The Times.
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