Seasonal visitor in pleasant apparel (5)
I believe the answer is:
santa
'seasonal visitor' is the definition.
(I've seen this in another clue)
'in pleasant apparel' is the wordplay.
'in' indicates the answer is hidden within the clue.
'SANTA' is hidden within 'pleasant apparel'.
(Other definitions for santa that I've seen before include "bringer of gifts" , "Present bringer" , "Dec's visitor?" , "Dad in a red and white outfit?" , "distributer of goodies" .)