Goes to be the butt of 3s jokes (6)

I believe the answer is:

stooge

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'butt of 3s jokes' is the definition.
'stooge' can be an answer for 'butt' (synonyms). I'm unsure of the 'of 3s jokes' bit.

'goes to be' is the wordplay.
'goes to' can be anagrammed to 'STOOGE'.
Though, I am not clear how this is indicated.

'the' is the link.

Can you help me to learn more?

(Other definitions for stooge that I've seen before include "lackey" , "Fall guy" , "Comical straight man" , "Performer who is butt of another's jokes" , "A comedian's assistant, butt of his jokes" .)

I've seen this clue in The Irish Independent.

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