Understanding, try to put it away inside (6)

I believe the answer is:

treaty

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'understanding' is the definition.
(treaty is a kind of understanding)

I can't explain the remainder of the clue.

(Other definitions for treaty that I've seen before include "Compact; concordat" , "Contract, pact" , "A pact between countries" , "Negotiation" , "convention?" .)

I've seen this clue in the Evening Standard.

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