Stormy sea - for me - is frightful (8)
I believe the answer is:
fearsome
'frightful' is the definition.
(thesaurus)
'stormy sea for me' is the wordplay.
'stormy' indicates an anagram.
'sea'+'for'='seafor'
'seafor' with letters rearranged gives 'fearso'.
'fearso'+'me'='FEARSOME'
'is' is the link.
(Other definitions for fearsome that I've seen before include "Of frightening appearance" , "Daunting" , "Fame rose and became frightening" , "Awful" , "Formidable" .)