Cried when one looked at (6)
I believe the answer is:
peeped
'looked at' is the definition.
'peeped' can be an answer for 'looked' (peeping is a kind of looking). I'm not certain of the 'at' bit.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for peeped that I've seen before include "Looked surreptitiously, maybe through keyhole" , "Looked covertly" , "Looked furtively at, like a certain Tom" .)