Funny person quit protecting aide's back (6)
I believe the answer is:
scream
'funny person' is the definition.
(I've seen this before)
'quit protecting aide's back' is the wordplay.
'quit' becomes 'scram' (both can mean to run away).
'protecting' is an insertion indicator (inserted letters are held or protected).
'back' says to take the final letters (the letter at the back).
The last letter of 'aide' is 'e'.
'scram' going around 'e' is 'SCREAM'.
(Other definitions for scream that I've seen before include "noise?" , "Yell in fear" , "Utter a piercing cry" , "Cry of anguish" , "Make high shrill sound as from fear" .)