Crossword Genius

Second double whiskey replaced by rum with no hesitation (5)

Ross

I believe the answer is:

trice

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'second' is the definition.
(both can mean a very short amount of time)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for trice that I've seen before include "Flash" , "Short time" , "Second" , "Haul" , "In a -- means very quickly" .)

I've seen this clue in The Telegraph.
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