Ingeniously frees from marine hazards (5)
I believe the answer is:
reefs
'marine hazards' is the definition.
(I've seen this in another clue)
'ingeniously frees' is the wordplay.
'ingeniously' is an anagram indicator (I've seen this in other clues).
'frees' is an anagram of 'REEFS'.
'from' is the link.
(Other definitions for reefs that I've seen before include "Groups of submerged rock" , "coral banks" , "Ridges of rock or sand beneath sea surface" , "Submerged ridges of rock or coral near the surface of water" .)