What mafia don may stand for? (6)

I believe the answer is:

godson

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'for?' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for godson that I've seen before include "No dogs (anag)" , "Boy one speaks for" , "Male godchild" , "Boy sponsored at baptism" , "member of Trinity?" .)

I've seen this clue in The Irish Times.

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