Crossword Genius

Capricious desire to overtake someone (7,4)

Ross

I believe the answer is:

passing whim

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'capricious' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'desire to overtake someone' is the wordplay.
'desire' becomes 'whim' (whim is a kind of desire).
'to' says to put letters next to each other (I've seen this in other clues).
'overtake someone' becomes 'passing' (I can't explain this - if you can you should believe this answer much more).
'whim' put after 'passing' is 'PASSING WHIM'.

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I've seen this clue in The Globe and Mail.
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