Crossword Genius

Saw it's rum that's mixed (6)

Ross

I believe the answer is:

truism

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'saw' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'it's rum that's mixed' is the wordplay.
'that's mixed' is an anagram indicator.
'its'+'rum'='itsrum'
'itsrum' is an anagram of 'TRUISM'.

Can you help me to learn more?

(Other definitions for truism that I've seen before include "An abvious truth" , "Obviously correct and verified statement" , "An obvious statement that says noting new or interesting" , "self-evident statement" , "Self-evident saying" .)

I've seen this clue in The Sun.
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