“to spell  for a thing,” to hanker after it, to desire possession.
to advertise, to put into print. “Spelt  in the leer,” i.e., advertised in the newspaper.

spell should not be used for “period of time.” Do not say “I shall stay a spell” if you mean you will “remain a little while,” the latter is to be preferred.

a turn of work, an interval of time. “Take a spell  at the capstern.”—Sea. “He took a long spell  at that tankard.” “After a long spell.”
contracted from spellken. “Precious rum squeeze at the spell ,” i.e., a good evening's work at the theatre, might be the remark of a successful pickpocket.
sb. a discourse, storyVariants: spelle, dat.Etymology: Anglo-Saxon spell