Important Phoenician city (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">important phoenician city</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sidon that I've seen before include "Ancient Phoenician city" , "Chief city of ancient Phoenicia" , "It was allied to Tyre in Biblical times" .)