Gangland boss better operating close to home (6)

I believe the answer is:

capone

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'gangland' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I don't see?

'boss better operating close to home' is the wordplay.
'boss better' becomes 'cap' (I've seen this before. I am not sure about the 'boss' bit.).
'operating' becomes 'on' (I've seen this in other clues).
'close to' says to take the final letters (the close/ending of).
The last letter of 'home' is 'e'.
'cap'+'on'+'e'='CAPONE'

Can you help me to learn more?

(Other definitions for capone that I've seen before include "Al ..., US gangster" , "US gangster (St Valentine's Day massacre)" , "Chicago gangster, d. 1947" , "Mountain said to be resting place of Noah's Ark" , "Italian-American gangster, d. 1947" .)

I've seen this clue in The Times.

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