Promises magic times (6)
I believe the answer is:
spells
I believe this clue is a triple definition!
'promises' is the first definition.
(as in 'this spells disaster')
'magic' is the second definition.
(magic spells)
'times' is the third definition.
(a spell can mean a short time)
(Other definitions for spells that I've seen before include "Magic influences" , "They're induced by magical incantations" , "Formulae believed to have magical force" , "Periods of times or witche's curses" , "Trances" .)