A 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 "This sum (anag)" , "Strip of land flanked by sea" , "Narrow linking piece of land" , "eg Corinth, Panama" , "Narrow strip of land in sea" .)

I've seen this clue in The Times and The Sunday Times.

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