Gave boy no orders other than 'Have a nice trip' (3,6)

I believe the answer is:

bon voyage

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

'other than have a nice trip' is the definition.
I know that 'trip' relates to this answer.

'gave boy no orders' is the wordplay.
'orders' is an anagram indicator.
'gave'+'boy'+'no'='gaveboyno'
'gaveboyno' anagrammed gives 'BON VOYAGE'.

Can you help me to learn more?

(Other definitions for bon voyage that I've seen before include "Have a nice cruise, monsieur" , "Have a good trip - on the briny" , "Have a good journey - at sea" , "travel well!" .)

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

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