More or less content to leave partner with the last word assuming terms of joint tenancy alarm you (6,4)

I believe the answer is:

pretty much

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'more or less' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for pretty much that I've seen before include "More or less" , "roughly" .)

I've seen this clue in The Telegraph.

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