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' means one lot of letters go next to another.
'little' means to remove the last letter (the word is not quite complete).
'devils' becomes 'imps' (devil-like creatures).
'imps' with its final letter taken away 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" .)