Crossword Genius

Banjo's expletive is weed (9,5)

Ross

I believe the answer is:

patersons curse

I'm a little stuck... Click here to teach me more about this clue!

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

'banjo's expletive' is the wordplay.
I cannot quite see how this works, but
'expletive' could be 'curse' (synonyms) and 'curse' is present in the answer.
This explanation may well be incorrect...

'is' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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