Horrify Queensland resort after decapitating horse (9)

I believe the answer is:

appaloosa

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

'horse' is the definition.
(Appaloosa is an example)

'horrify queensland resort after decapitating' is the wordplay.
I cannot really see how this works, but
'horrify' could be 'appal' (synonyms) and 'appal' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for appaloosa that I've seen is " Horse breed, with spotted rump".)

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

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