Narrow strip of land with sea on either side (7)

I believe the answer is:

isthmus

(Other definitions for isthmus that I've seen before include "Narrow strip joining larger areas of land" , "Narrow land link" , "Narrow strip of land connecting two large masses" , "Narrow neck of land connecting two larger portions" , "This sum for a narrow piece of land" .)

I've seen this clue in The Irish Times.

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