Crossword Genius

Line for The Apprentice, given lucre ran out (8,5)

Ross

I believe the answer is:

learning curve

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

'given lucre ran out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'given'+'lucre'+'ran'='givenlucreran'
'givenlucreran' with letters rearranged gives 'LEARNING CURVE'.

Can you help me to learn more?

(Other definitions for learning curve that I've seen before include "Gradual acquisition of experience" , "Process of getting up to speed with info" , "Graph of educational progression?" , "Rate of progress in acquiring new skills" , "Process of increasing understanding" .)

I've seen this clue in The Telegraph.
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