Plans to do something to stop twitches (7)
I believe the answer is:
tactics
'plans' is the definition.
(tactic is a kind of plan)
'do something to stop twitches' is the wordplay.
'do something' becomes 'act' (to act is to do something).
'to stop' is an insertion indicator (stopping can mean blocking a gap).
'twitches' becomes 'tics' (tic is a kind of twitch).
'act' put inside 'tics' is 'TACTICS'.
'to' acts as a link.
(Other definitions for tactics that I've seen before include "Military skill" , "Plans" , "Actions planned to achieve an end" , "Art of military warfare" , "Art of military manoeuvre" .)