Archipelago component (4)
I believe the answer is:
isle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">archipelago component</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 isle that I've seen before include "Fair one is in shipping bulletin" , "It lies badly in water" , "being impossible without water" , "Eg, Sheppey" , "Man's one" .)