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I leave the law to the big guns (8)

Ross

I believe the answer is:

ordnance

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'guns' is the definition.
(ordnance can mean guns or artillery)

I can't explain the rest of the clue.

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(Other definitions for ordnance that I've seen before include "Mounted guns, cannon" , "Car on end (anag) - artillery" , "regulation" , "Cannon; munitions" , "guns etc." .)

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