Ring-shaped (7)
I believe the answer is:
annular
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ring-shaped</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for annular that I've seen before include "Doughnut-shaped -- a LAN run (anag)" , "Circular" , "Forming a ring" , "Ring-shaped" , "Ringlike; type of eclipse" .)