Crossword Genius

The sort of service for mum? (6)

Ross

I believe the answer is:

silent

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

'for mum?' is the definition.
(to keep mum can informally mean to stay silent)

'the sort of service' is the wordplay.
I cannot really 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 'silen' 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).

Can you help me to learn more?

(Other definitions for silent that I've seen before include "Taciturn" , "Unheard" , "Listen (anag.)" , "Lacking sound" , "Mute" .)

I've seen this clue in the Evening Standard.
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