Uncomplicated event for unattractive yachtsmen? (5,7)

I believe the answer is:

plain sailing

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'for unattractive yachtsmen?' is the definition.
I can't tell whether this defines the answer.

'uncomplicated event' is the wordplay.
'uncomplicated' becomes 'plain' (I've seen this before).
'event' becomes 'sailing' (I've seen this before).
'plain'+'sailing'='PLAIN-SAILING'

Can you help me to learn more?

(Other definitions for plain sailing that I've seen before include "progress made in prairie schooner?" , "Simple" , "effortless progress" , "easy job" , "Trouble-free progress" .)

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

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