Twitch (3)
'twitch' is the definition.
(I know that tic is a type of twitch)
This is the entire clue.
(Other definitions for tic that I've seen before include "Twitch in analytical way" , "Involuntary muscle movement" , "Involuntary habitual response" , "jerk" , "Twitch in anticipation" .)
'twitch' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for spasm that I've seen before include "Fit" , "Sudden involuntary contraction of a muscle" , "Convulsive action" , "Jerk" , "sudden attack" .)
(Other definitions for stream that I've seen before include "Brook, burn" , "Running liquid" , "'Current, flow (6)'" , "Current - file" , "Flow from master" .)