Dancer or Prancer (8)
I believe the answer is:
reindeer
'dancer or prancer' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for reindeer that I've seen before include "Animal that pulls Santa's sleigh" , "Beast" , "D [DECORATION]" , "'Dancer or Prancer, say (8)'" , "Red-nosed Rudolf is one" .)