Coach's first name on "Cheers" (5)
I believe the answer is:
ernie
'coach's first name on cheers' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ernie that I've seen before include "Guy" , "Machine that produces the winning Premium Bond numbers" , "Sergeant Bilko, for one" , "Wise for instance" , "Boy" .)