Threaten to cane 'em 'orribly! (6)

I believe the answer is:

menace

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'threaten' is the definition.
(synonyms)

'cane 'em 'orribly' is the wordplay.
'cane 'em' anagrams to 'MENACE'.
But, I am not sure how this is indicated.

'to' is the link.

Can you help me to learn more?

(Other definitions for menace that I've seen before include "Intimidate" , "ominous atmosphere" , "Threat; threaten" , "Intimidation" , "Threaten with harm or danger" .)

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