Brains found in Amundsen Sea (5)
I believe the answer is:
sense
'brains' is the definition.
(I've seen this in another clue)
'in amundsen sea' is the wordplay.
'in' indicates a hidden word.
'SENSE' is hidden in the letters of 'amundsen sea'.
'found' is the link.
(Other definitions for sense that I've seen before include "Perceive, detect" , "Be vaguely aware of" , "Feel intuitively" , "Hearing maybe" , "Perceive; meaning" .)