"Eek!" (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
yikes
'eek' is the definition.
(I know that eek can be written as yikes)
This is the entire clue.
(Other definitions for yikes that I've seen before include "that was hot!" , "Expression of shock" , "Expression of surprise" , "Gosh! - Oh no!" , "Exclamation of surprise or alarm" .)