English county on the North Sea (5)
I believe the answer is:
essex
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">english county on the north sea</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for essex that I've seen before include "Favourite of Elizabeth I" , "County NE of London" , "County east of London" , "County, its tasteless moneyed Man" , "Chelmsford's county" .)