Crossword Genius

Such a person may not use his tongue when speaking (9)

Ross

I believe the answer is:

bilingual

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

'such a person may not use his' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'tongue when speaking' is the wordplay.
I cannot really understand how this works, but
'tongue' could be 'lingua' (synonyms) and 'lingua' is found in the answer.
The remaining letters 'bil' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for bilingual that I've seen before include "Able to speak two languages" , "having two tongues" , "Adept in two languages" , "Speaking two languages" , "Like interpreter" .)

I've seen this clue in The Globe and Mail.
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