Isle on which Apollo was born (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">isle on which apollo was born</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 delos that I've seen before include "Island of the Cyclades" , "Greek island, supposed birthplace of Apollo" , "Apollo's birthplace" .)