### Clue: Ultimately ungulates best, Santa employing reindeer, say? (4)
### Answer: STAG 
 ### Explanation: Definition: reindeer, say
 **Last letters, respectively, of**(Ultimately) "ungulates best, Santa employing".
Defn: …, or a male ungulate, perhaps employed by Santa to pull his sleigh.
Trivia questions: 1. Name Santa's 8 original reindeer. Hint: Rudolph is not one of them. 2. What gender are they?