Heavenly hunter brilliantly belted (5)

I believe the answer is:

orion

I'm a little stuck... Click here to teach me more about this clue!

'heavenly hunter' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

(Other definitions for orion that I've seen before include "hero" , "Large constellation" , "Group of stars" , "Belted constellation" , "He hunted" .)

I've seen this clue in the Evening Standard.

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