Crossword Genius

Takes the plunge without consulting the directors! (4,9)

Ross

I believe the answer is:

goes overboard

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

'takes the plunge without' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'consulting the directors' is the wordplay.
'consulting' becomes 'goesover' (I can't explain this - if you can you should give a lot more credence to this answer).
'the directors' becomes 'board' (board of directors).
'goesover'+'board'='GOES OVERBOARD'

Can you help me to learn more?

I've seen this clue in The Irish News.
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