I'm scared and keep looking round endlessly (3)
I believe the answer is:
eek
'i'm scared' is the definition.
(exclamation showing fear)
'keep looking round endlessly' is the wordplay.
'keep looking' becomes 'ee' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'round' becomes 'token' (token is a kind of round).
'endlessly' means to look at the middle letters (the ends of the words are removed).
The central letter of 'token' is 'k'.
'ee'+'k'='EEK'
'and' acts as a link.
(Other definitions for eek that I've seen before include "Expression of mild alarm" , "I'm frightened!" , "Expression of surprise" , "Yikes! Oo-er!" , "Cry of alarm" .)