Sitting MP’s election advantage (4,4)

I believe the answer is:

safe seat

(Other definitions for safe seat that I've seen before include "Constituency MP prefers" , "Constituency unlikely to be lost" , "MP's desire" , "What the Uxbridge and South Ruislip constituency is for Boris" , "Parliamentary constituency with a substantial majority for the incumbent" .)

I've seen this clue in The Mirror.

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