Crossword Genius

Did spring rental, with a parking space thrown in (5)

Ross

I believe the answer is:

leapt

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

'did spring' is the definition.
(I've seen this before)

'rental with a parking space thrown in' is the wordplay.
I cannot quite see how this works, but
'a' is within the answer.
'parking' could be 'p' and 'p' is present in the answer.
The remaining letters 'let' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for leapt that I've seen before include "Jumped on plate" , "Vaulted" , "gone up dramatically" , "Made spring" , "rose fast" .)

I've seen this clue in The Independent.
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