Manages to take in island remains (5)
I believe the answer is:
ruins
'remains' is the definition.
(eg remains of a building)
'manages to take in island' is the wordplay.
'manages' becomes 'runs' (I've seen this in another clue).
'to take in' is an insertion indicator.
'island' becomes 'i'.
'runs' going around 'i' is 'RUINS'.
(Other definitions for ruins that I've seen before include "Collapsed, disintegrated buildings" , "Wrecks" , "Broken-down remnants" , "Rubble" , "Wrecked buildings" .)