For me sea can be scary (8)
I believe the answer is:
fearsome
'scary' is the definition.
(I've seen this in another clue)
'for me sea can be' is the wordplay.
'can be' is an anagram indicator.
'for'+'me'+'sea'='formesea'
'formesea' with letters rearranged gives 'FEARSOME'.
(Other definitions for fearsome that I've seen before include "Dreadful" , "Horrendous" , "Fame rose and became frightening" , "Formidable" , "Daunting" .)