Having received one in simple English, son acts as diplomat (10)

I believe the answer is:

negotiates

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'having received one in simple english son acts as diplomat' is the definition.
I can't judge whether this defines the answer.

'having received one in simple english son acts as' is the wordplay.
'having received' is an insertion indicator.
'one' becomes 'i' (roman numeral).
'in' means one lot of letters goes inside another.
'simple english son acts' becomes 'notates' (I am not sure about this - if you are sure you should believe this answer much more).
'as' becomes 'eg' (I've seen this in other clues).
'notates' enclosing 'eg' is 'negotates'.
'i' going within 'negotates' is 'NEGOTIATES'.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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