Crossword Genius

Daredevil son to clean fastener with tip of rag (12)

Ross

I believe the answer is:

swashbuckler

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

'daredevil' is the definition.
(I know that daredevil can be written as swashbuckler)

'son to clean fastener with tip of rag' is the wordplay.
I cannot quite see how this works, but
'son' could be 's' (genealogical abbreviation for son) and 's' is found in the answer.
'clean' could be 'wash' (washing is a kind of cleaning) and 'wash' is located in the answer.
'fastener' could be 'buckle' (buckle is a kind of fastener) and 'buckle' is found in the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for swashbuckler that I've seen before include "Gascon" , "Errol Flynn on film, for instance" , "To prepare explorer" , "One given to derring-do" , "Daredevil" .)

I've seen this clue in The Guardian.
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