Most unheard of! (6,8)

I believe the answer is:

silent majority

'most' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I don't see?

'unheard of' is the wordplay.
'unheard' becomes 'silent' (I've seen this before).
'of' becomes 'majority' (I am not sure about this - if you are sure you should believe this answer much more).
'silent'+'majority'='SILENT MAJORITY'

(Another definition for silent majority that I've seen is " not wanting a fuss".)

I've seen this clue in The Times.

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