Queen managed to reach island (4)
I believe the answer is:
rani
'queen' is the definition.
(historical term for a Hindu queen)
'managed to reach island' is the wordplay.
'managed' becomes 'ran' (both can mean organised or was in charge of).
'to reach' says to put letters next to each other.
'island' becomes 'i' (geographical abbreviation).
'ran'+'i'='RANI'
(Other definitions for rani that I've seen before include "Raja's wife" , "Rajah's wife from Iran" , "Hindu queen or princess" , "Wife of a raja" , "Wife of a rajah" .)