Attractive yacht at sea beyond Cape (6)
I believe the answer is:
catchy
'attractive' is the definition.
('catchy' can be similar in meaning to 'attractive')
'yacht at sea beyond cape' is the wordplay.
'at sea' is an anagram indicator.
'beyond' is a charade indicator (letters next to each other).
'cape' becomes 'c' (abbreviation used on maps).
'yacht' anagrammed gives 'atchy'.
'atchy' put after 'c' is 'CATCHY'.
(Other definitions for catchy that I've seen before include "Attention-grabbing" , "(Of a tune) likely to remain in one's head" , "Of tune, pleasant and easily remembered" , "Musically memorable" , "(Of tune) infectious" .)