Crossword Genius

Roughly nine letters Matt is sending to Coventry (6,9)

Ross

I believe the answer is:

silent treatment

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'sending to coventry' is the definition.
I can't judge whether this definition defines the answer.

'roughly nine letters matt' is the wordplay.
'roughly' is an anagram indicator.
'nine'+'letters'+'matt'='ninelettersmatt'
'ninelettersmatt' is an anagram of 'SILENT TREATMENT'.

'is' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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