Ex-pat changes first name to Charlie for some protection (6)

'some protection' is the definition.

'ex-pat changes first name to charlie' is the wordplay.
I cannot quite understand how this works, but
'name' could be 'dom' and 'dom' is found within the answer.
'charlie' could be 'c' (phonetic alphabet: alpha, bravo, charlie etc.) and 'c' is located in the answer.
The remaining letters 'on' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'for' acts as a link.

Can you help me to learn more?