A lot of money is required for providing nuclear power (4)

I believe the answer is:

pile

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'a lot of money' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for pile that I've seen before include "large amount of money" , "A heap or stack" , "Fortune" , "Post" , "lot of money" .)

I've seen this clue in The Irish News.

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