Pound limits country after banks withdraw before debt's term is fixed (9)

I believe the answer is:

permanent

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'is fixed' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for permanent that I've seen before include "Constant" , "This way for the track" , "full-time" , "Lasting, enduring" , "Unchanging" .)

I've seen this clue in The Independent.

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