County town of Devon (6)
I believe the answer is:
exeter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">county town of devon</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for exeter that I've seen before include "The modern Isca Dumnoniorum" , "West Country cathedral city" , "City at S. end of M five" , "Oxford college; city" , "South-western English city" .)