Enchanting Christmas visitors peaceful mostly (7)
I believe the answer is:
magical
'enchanting' is the definition.
(I've seen this before)
'christmas visitors peaceful mostly' is the wordplay.
'christmas visitors' becomes 'magi' (I've seen this in other clues).
'peaceful' becomes 'calm' ('calm' is associated in meaning with 'peaceful').
'mostly' means to remove the last letter.
'calm' with its last letter removed is 'cal'.
'magi'+'cal'='MAGICAL'
(Other definitions for magical that I've seen before include "miraculous!" , "Occult, supernatural" , "charmed" , "Bewitching" , "Enchanting or spell-binding" .)