Saw drunk sit with rum (6)

I believe the answer is:

truism

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

'drunk sit with rum' is the wordplay.
'drunk' indicates anagramming the letters.
'with' is a charade indicator (letters next to each other).
'sit' after 'rum' is 'rumsit'.
'rumsit' with letters rearranged gives 'TRUISM'.

Can you help me to learn more?

(Other definitions for truism that I've seen before include "Bromide" , "Something obvious" , "Statement saying nothing new" , "Obviously correct and verified statement" , "An abvious truth" .)

I've seen this clue in The Sun.

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