Saint leaves the island, coldly (5)
I believe the answer is:
icily
'coldly' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for icily that I've seen before include "Coldly" , "in unfriendly way" , "Without feeling" , "In a frosty manner" , "In a cool manner" .)