For me sea can be terrifying (8)
I believe the answer is:
fearsome
'terrifying' is the definition.
(I've seen this before)
'for me sea can be' is the wordplay.
'can be' indicates anagramming the letters.
'for'+'me'+'sea'='formesea'
'formesea' is an anagram of 'FEARSOME'.
(Other definitions for fearsome that I've seen before include "Horrendous" , "Frightening, terrible" , "Daunting" , "Fame rose and became frightening" , "Dreadful" .)