Cutter spotted with barrels mostly charged (3-5)

I believe the answer is:

saw-blade

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'barrels mostly charged' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'cutter spotted' is the wordplay.
'cutter' becomes 'saw' (I've seen this in other clues).
'spotted' becomes 'blade' (I can't explain this - if you can you should give a lot more credence to this answer).
'saw'+'blade'='SAW-BLADE'

'with' is the link.

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I've seen this clue in The Independent.

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