Crossword Genius

Arise when Santa's reindeer gets UK honour (4,2,2)

Ross

I believe the answer is:

come to be

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

'arise' is the definition.
(thesaurus)

'santa's reindeer gets uk honour' is the wordplay.
I cannot really understand how this works, but
'reindeer' could be 'comet' (name of one of Santa Claus reindeer) and 'comet' is present in the answer.
'honour' could be 'obe' (Order of the British Empire) and 'obe' is located in the answer.
No letters remain.
This explanation may well be incorrect...

'when' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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