Graceful fish east of cove (7)
I believe the answer is:
genteel
'graceful' is the definition.
(thesaurus)
'fish east of cove' is the wordplay.
'fish' becomes 'eel' (eel is a type of fish).
'east of' is a charade indicator (letters next to each other) (some letters go to the right of others).
'cove' becomes 'gent' (I've seen this before).
'eel' put after 'gent' is 'GENTEEL'.
(Other definitions for genteel that I've seen before include "Terribly polite" , "Courteous, well-bred" , ""Refayned"" , "Well mannered" , "Cultured; polite" .)