Crossword Genius

How to address the head boy? (6)

Ross

I believe the answer is:

master

I'm a little stuck... Click here to teach me more about this clue!

'head boy?' is the definition.
'master' can be an answer for 'head' (thesaurus). I am not sure about the 'boy?' bit.

'how to address the' is the wordplay.
I cannot quite understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is located in the answer.
The remaining letters 'maser' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for master that I've seen before include "Maestro; teacher" , "Overcome; original film" , "controlling" , "The boss" , "Overcome; original copy" .)

I've seen this clue in the Evening Standard.
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