Bethlehem visitors can include one conjuror (8)
I believe the answer is:
magician
'conjuror' is the definition.
(synonyms)
'bethlehem visitors can include one' is the wordplay.
'bethlehem visitors' becomes 'magi' (I've seen this in another clue).
'include' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'can' going around 'i' is 'cian'.
'magi'+'cian'='MAGICIAN'
(Other definitions for magician that I've seen before include "Wizard like cartoon Mandrake" , "Conjuror or sorcerer" , "Conjurer, illusionist" , "trickster" , "Prestidigitator" .)