Clearly I’m better than to make one resentful (8)

I believe the answer is:

embitter

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

'make one resentful' is the definition.
I can't tell whether this definition defines the answer.

'clearly i'm better than' is the wordplay.
'i'm better' can be anagrammed to 'EMBITTER'.
Though, I'm unsure how the anagram is indicated.

'to' is the link.

Can you help me to learn more?

(Other definitions for embitter that I've seen before include "cause resentment" , "poison" , "incense" , "Create resentment" , "Make sour and resentful" .)

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

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