Comics squeal (3)
I believe the answer is:
eek
'comics squeal' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eek that I've seen before include "Expression of mild alarm" , "Expression of mild fright" , "Sound of alarm" , "Yikes! Oo-er!" , "I'm frightened!" .)