Clue: In every other Sennett reel, artist begs (8)
Answer: ENTREATS
Explanation: reference to ~~Mark~~ *Mack *Sennett , founder of Keystone Studios – *thanks to Hornbeam and drofle for pointing out my typo* 
every other letter from s-**E**-n-**N**-e-**T**-t **R**-e-**E**-l **A**-r-**T**-i-**S**-t