Ill-advised build-up of foreign talk (5)

I believe the answer is:

babel

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'talk' is the definition.
(I have seen 'Confused talk' mean 'babel' so perhaps 'talk' could also mean 'babel')

I cannot understand how the remainder of the clue works.

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(Other definitions for babel that I've seen before include "incoherent sounds" , "Tower built by Noah's descendants to reach to heaven" , "Biblical tower site" , "Place of cacophony" , "Vocal confusion" .)

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

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