Crossword Genius

Be extravagant and prepare to sail (4,3,4,3)

Ross

I believe the answer is:

push the boat out

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

'be extravagant and prepare' is the definition.
I know nothing about this answer so I can't judge whether this works.

'to sail' is the wordplay.
I cannot really understand how this works, but
'to' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for push the boat out that I've seen before include "Entertain or celebrate lavishly" , "launch" , "get ready for a row?" , "Punters may" , "party?" .)

I've seen this clue in The Daily Express.
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