Mains connection device (O, not E) (7)

I believe the answer is:

adaptor

(Other definitions for adaptor that I've seen before include "Electrical convertor" , "Connector for differing plug types" , "Connector (O, not E)" , "Device that enables more than one plug per socket" , "Tap road (anag)" .)

I've seen this clue in The Times.

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