Some unhappy couples may decide to (4)

I believe the answer is:

part

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'some' is the definition.
(only part of something)

I cannot understand how the remainder of the clue works.

(Other definitions for part that I've seen before include "Bit - leave" , "Region" , "Sever; portion" , "Separate - role" , "Constituent - something to play?" .)

I've seen this clue in The Globe and Mail.

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