### Clue: His clatter was endlessly fantastic (7,5)
### Answer: CHARLIE WATTS 
 ### Explanation: Definition: His clatter was endlessly fantastic
 **Anagram of**(.. fantastic) [HIS CLATTER + "was" **minus ****its last letter**(endlessly) ].
Answer: Drummer with the Rolling Stones, whose drumbeats might (a little harshly) be called clatter/the sound of something hard hitting another hard thing, but was always fantastic.  Died 24 Aug 2021.