Myths about little devils appeal (7)
I believe the answer is:
implore
'appeal' is the definition.
(thesaurus)
'myths about little devils' is the wordplay.
'myths' becomes 'lore' (I've seen this in another clue).
'about' is a charade indicator (letters next to each other).
'little' means to remove the last letter (the word is not quite complete).
'devils' becomes 'imps' (devil-like creatures).
'imps' with its last letter removed is 'imp'.
'lore' put after 'imp' is 'IMPLORE'.
(Other definitions for implore that I've seen before include "More lip (anag)" , "Beg desperately" , "press" , "Beg earnestly, entreat" , "Beg earnestly, beseech" .)