I start to recover assigned to stern (4)
I believe the answer is:
iron
'to stern' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for iron that I've seen before include "See 14" , "Heavy metal that rusts easily" , "sports club" , "Fe - golf club" , "rations in emergency?" .)