Who's a pretty boy? A Mafia boss is! (6)

I believe the answer is:

adonis

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'who's a pretty boy?' is the definition.
I can't judge whether this defines the answer.

'a mafia boss is' is the wordplay.
'mafia boss' becomes 'don' (term for a mafia leader).
'a'+'don'+'is'='ADONIS'

Can you help me to learn more?

(Other definitions for adonis that I've seen before include "A very handsome legendary Greek" , "striking youth" , "Beautiful (Greek) man" , "Greek idol" , "lovely chap" .)

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