Missile a slob could use? (5)

I believe the answer is:

bolas

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'use?' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

'missile a slob' is the wordplay.
'a slob' can be anagrammed to 'BOLAS'.
Though, I'm not clear how the anagram is indicated.

'could' is the link.

Can you help me to learn more?

(Another definition for bolas that I've seen is " What a gaucho may have".)

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