Crossword Genius

Radiate good time, both endlessly and across the world (6)

Ross

I believe the answer is:

global

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'across the world' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for global that I've seen before include "Comprehensive" , "all over the place" , "Of the whole world, worldwide" , "Affecting the whole world" , "Universal" .)

I've seen this clue in The Daily Express.
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