A turning point in making a purchase (7)

I believe the answer is:

fulcrum

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'a turning point' is the definition.
'fulcrum' can be an answer for 'point' (I have seen 'Pivotal point' mean 'fulcrum' so perhaps 'point' could also mean 'fulcrum'). I'm not sure about the 'a turning' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for fulcrum that I've seen before include "Pivot on which a lever moves" , "prop" , "place to get a purchase!" , "Pivotal point" , "The point on which a lever turns" .)

I've seen this clue in The Globe and Mail.

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