Spouse-limiting policy (8)

I believe the answer is:

monogamy

(Other definitions for monogamy that I've seen before include "Practice of having a single mate" , "Practice of having only one wife or husband" , "System of being married to only one person at a time" , "Faithfulness to one partner" , "Having only one mate" .)

I've seen this clue in the Sydney Morning Herald.

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