Mesmeric, spellbinding (8)
I believe the answer is:
hypnotic
I believe this clue is a double definition.
'mesmeric' is the first definition.
(I know that mesmeric can be written as hypnotic)
'spellbinding' is the second definition.
(I know that spellbinding can be written as hypnotic)
(Other definitions for hypnotic that I've seen before include "Trance-inducing" , "Entrancing" , "Mesmerising" , "Compelling" , "Sleeping pill" .)