A sound from chick, look! (4)
I believe the answer is:
peep
I believe this clue is a double definition.
'a sound from chick' is the first definition.
(sound made by a bird)
'look' is the second definition.
(peep can mean to look at something)
(Other definitions for peep that I've seen before include "Look quickly" , "Look slyly" , "Chirp" , "Look furtively (in both directions)" , "Spy" .)