Nice wishes for a journey! (3,6)

I believe the answer is:

bon voyage

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'nice wishes for a journey' is the definition.
I know that 'journey' relates to this answer.

'for a journey' is the wordplay.
'for' becomes 'bon' (I can't justify this - if you can you should believe this answer much more).
'a journey' becomes 'voyage' (voyage is a kind of journey).
'bon'+'voyage'='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 Hindu.

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