Prospect having 1000% growth at the start must have hit supply partner (3,4)

I believe the answer is:

lie with

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'1000% growth at the start must have hit supply partner' is the definition.
I can't tell whether this defines the answer.

'prospect having' is the wordplay.
'prospect' becomes 'lie' (I can't explain this - if you can you should believe this answer much more).
'having' becomes 'with' (I've seen this before).
'lie'+'with'='LIE WITH'

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I've seen this clue in The Independent.

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