There's nothing to be said for such dissent (6,7)

I believe the answer is:

silent protest

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'there's nothing to be said' is the definition.
I can't tell whether this definition defines the answer.

'such dissent' is the wordplay.
'such' becomes 'silent' (I can't explain this - if you can you should give a lot more credence to this answer).
'dissent' becomes 'protest' (synonyms).
'silent'+'protest'='SILENT PROTEST'

'for' acts as a link.

Can you help me to learn more?

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

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