Penultimate word in a fairy tale (4)
I believe the answer is:
ever
'penultimate word in a fairy tale' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ever that I've seen before include "Always and permanent" , "Eternity" , "Perpetually" , "Possibly" , "To the end of time" .)