Crossword Genius

Possibly proves at the finish it's the way to run short (9)

Ross

I believe the answer is:

overspend

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But I can't explain it at all! Could you help me understand?

(Other definitions for overspend that I've seen before include "extravagant" , "splurge" , "Consume too much" , "Use up too much money" , "Buy too much" .)

I've seen this clue in The Irish Independent.
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