Crossword Genius

Fires destroy town square (5)

Ross

I believe the answer is:

sacks

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

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sacks that I've seen before include "Raids; boots out" , "rifles" , "Plunders; fires" , "Dismisses; bags" , "Large strong bags" .)

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