Crossword Genius

Start blazing away (5,4)

Ross

I believe the answer is:

catch fire

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

'start' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how they can define each other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for catch fire that I've seen is " Get excited".)

I've seen this clue in The Globe and Mail.
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