Personal turning point in bank legislation (5)

I believe the answer is:

ankle

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'personal turning point' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'in bank legislation' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ANKLE' is hidden in the letters of 'bank legislation'.

Can you help me to learn more?

(Other definitions for ankle that I've seen before include "Foot-leg connector" , "Bone over foot" , "Joint between foot and leg" , "Leg-joint" , "Major joint in lower limb" .)

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

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