Bad-tempered member of comedy team finishing early before end of day (7)
I believe the answer is:
grouchy
'bad-tempered' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for grouchy that I've seen before include "ill-tempered" , "Querulous" , "Grumpy" , "Bad-tempered" , "Given to grumbling" .)