Treaty stored on phone (4)

I believe the answer is:

pact

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'treaty' is the definition.
(I know that pact is a type of treaty)

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

Can you help me to learn more?

(Other definitions for pact that I've seen before include "Treaty, formal agreement" , "Written agreement between two states" , "Settlement" , "International treaty" , "deal" .)

I've seen this clue in The Independent.

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