Twitch (3)
'twitch' is the definition.
(tic is a kind of twitch)
This is all the 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 in another clue)
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" .)
'twitch' is the definition.
(I know that tweak is a more specific form of the action the twitch)
This is all the clue.
(Other definitions for tweak that I've seen before include "Make fine adjustment" , "Edit" , "Adjust slightly" , "Make small adjustments" , "Squeeze with the fingers" .)
(Other definitions for stream that I've seen before include "Master (anag) - current" , "Small narrow flow" , "'Current, flow (6)'" , "comprising a load of drips?" , "Quantity of water" .)