Crossword Genius

Startled, saying “Run” after incursion by Australian, bloodthirsty (10)

Ross

I believe the answer is:

sanguinary

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

'bloodthirsty' is the definition.
(I know that bloodthirsty can be written as sanguinary)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for sanguinary that I've seen is " hopeful".)

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