Crossword Genius

Flush and show you've been taken unawares (5)

Ross

I believe the answer is:

start

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

'flush' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for start that I've seen before include "Outset" , "Begin to recoil?" , "Begin; flinch" , "lead" , "Beginning" .)

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