Under is indeed the correct spelling.
Some example sentences are:
The bleach is under the sink.
Put this thermometer under your tongue.
Have you looked under the cushions?
The duration of Under Your Spell - film - is 1.03 hours.
Under a Spell - 2009 was released on: USA: 2009
Under Your Spell Again was created on 1959-07-13.
Under Your Spell - film - was created on 1936-11-06.
Under a Spell - 1925 was released on: USA: 5 January 1925
Related to being under an actual magical spell, it means that someone is captivated by another person, or influenced by them.
In Word, the spell-check feature can be found under the review tab in the proofing group.
To hold under or as if under a spell; enchant or fascinate.
Under Your Spell - 1936 is rated/received certificates of: USA:Approved USA:Passed (National Board of Review)
it is about a girl under a spell
to place under a spell; be witch
HUGELY unlikely.