Stare when I cry out aloud (7)
I believe the answer is:
eyeball
'stare' is the definition.
(I've seen this before)
'i cry out aloud' is the wordplay.
'i' becomes 'eye' (I've seen this in other clues).
'cry out' becomes 'bawl'.
'aloud' indicates a 'sounds like' (homophone) clue.
'bawl' is a homophone of 'ball'.
'eye'+'ball'='EYEBALL'
'when' acts as a link.
(Other definitions for eyeball that I've seen before include "Watch" , "It was cut in Un Chien Andalou" , "something in orbit" , "One faces one in confrontation" , "not exact" .)