Impish (11)
'impish' is the definition.
(synonyms)
This is all the clue.
(Other definitions for mischievous that I've seen before include "Spiteful" , "full of monkey business" , "Playfully troublemaking" , "Impish" , "Naughty" .)
'impish' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for elfin that I've seen before include "Small, delicate, mischievous and attractive" , "Delicate little" , "Like a tiny fairy" , "Mischievous sprite" , "Small and fragile" .)
(Another definition for rascally that I've seen is " Mischievous".)