Narrow connecting part/strip (7)

I believe the answer is:

isthmus

(Other definitions for isthmus that I've seen before include "Narrow neck of land connecting two larger portions" , "Narrow strip linking two larger areas of land" , "Narrow strip of land with water on two sides" , "Narrow strip joining larger areas of land" , "Narrow strip of land connecting two large masses" .)

I've seen this clue in The Guardian.

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