Jack, the boy possibly with Samuel (7)

I believe the answer is:

johnson

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'with samuel' is the definition.
The definition suggests a singular noun which matches the answer.

'jack the boy' is the wordplay.
'jack' becomes 'john' (I am not sure about this - if you are sure you should believe this answer much more).
'the boy' becomes 'son' (male child).
'john'+'son'='JOHNSON'

'possibly' acts as a link.

Can you help me to learn more?

(Other definitions for johnson that I've seen before include "one of two presidents" , "Lexicographical doctor" , "harmless drudge?" , "Samuel -, lexicographer" , "Lexicographic doctor" .)

I've seen this clue in the Evening Standard.

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