Making shooters in mug things will get wild! (11)

I believe the answer is:

gunsmithing

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'making' is the definition.
Both the definition and answer are present participle verbs.
Maybe they are linked in a way I don't understand?

'shooters in mug things will get wild' is the wordplay.
'in mug things' can be anagrammed to 'GUNSMITHING'.
But, I'm not sure how this is indicated.

Can you help me to learn more?

I've seen this clue in The Independent.

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