Crossword Genius

Enter into an arrangement with shrink (8)

Ross

I believe the answer is:

contract

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

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

Can you help me to learn more?

(Other definitions for contract that I've seen before include "Shrink in written agreement" , "bargain" , "settlement" , "Covenant" , "Arrangement to commit murder" .)

I've seen this clue in The Irish Times.
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