Crossword Genius

Baggage fires (5)

Ross

I believe the answer is:

sacks

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'fires' is the definition.
('sack' can be a synonym of 'fire')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sacks that I've seen before include "Plunders; fires" , "Terminates employment as punishment" , "Discharges" , "sends up in flames" , "Dismisses; bags" .)

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