Crossword Genius

Best pedalo’s left out at sea for something better? (9)

Ross

I believe the answer is:

speedboat

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

'best' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'pedalo's left out at sea for something better?' is the wordplay.
I cannot really see how this works, but
'at' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for speedboat that I've seen before include "High-speed vessel" , "swift craft" , "A fast motor vessel" .)

I've seen this clue in The Times.
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