Shorten "enter into an agreement" (8)

I believe the answer is:

contract

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'shorten' is the definition.
(I know that shorten can be written as contract)

I don't understand the remainder of the clue.

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(Other definitions for contract that I've seen before include "type of bridge" , "Undertake" , "Binding agreement between two or more" , "Pick up" , "Make smaller" .)

I've seen this clue in the Evening Standard.

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