Crossword Genius

Excursion heading off after hot period (4)

Ross

I believe the answer is:

hour

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'period' is the definition.
(period of time)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for hour that I've seen before include "Sixty minutes" , "See 12" , "60 14 acrosses" , "(Period of) time" , "See 20" .)

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