Sailor showing fears are misplaced (8)
I believe the answer is:
seafarer
'sailor' is the definition.
(I know that seafarer is a type of sailor)
'fears are misplaced' is the wordplay.
'misplaced' indicates anagramming the letters.
'fears'+'are'='fearsare'
'fearsare' anagrammed gives 'SEAFARER'.
'showing' is the link.
(Other definitions for seafarer that I've seen before include "One travelling by ship" , "One going by ship" , "man being attracted by waves?" , "'Mariner, sailor (8)'" , "Sinbad?" .)