Crossword Genius

Leave for work (7,7)

Ross

I believe the answer is:

busmans holiday

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

'leave for work' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'leave for work' is the wordplay.
I cannot quite understand how this works, but
'leave' could be 'holiday' (I've seen this before) and 'holiday' is found in the answer.
'work' could be 'man' (manning is a kind of working) and 'man' is located in the answer.
The remaining letters 'buss' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for busmans holiday that I've seen before include "Leisure time spent doing more of work subjects" , "Break with continuity" .)

I've seen this clue in The Times and The Sunday Times.
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