Irregular movement with sign of approval reportedly (3)
I believe the answer is:
tic
'irregular movement' is the definition.
(bodily movement)
'sign of approval reportedly' is the wordplay.
'sign of approval' becomes 'tick' (I've seen this before).
'reportedly' shows a homophone (sound like).
'tick' is a homophone of 'TIC'.
'with' acts as a link.
(Other definitions for tic that I've seen before include "Involuntary habitual response" , "Twitch in anticipation" , "Involuntary twitch" , "Nervous twitch" , "Convulsive twitch (of face)" .)