A bit of a twitch, somehow (3)
I believe the answer is:
tic
This clue could be a double definition.
'a bit' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'twitch somehow' is the second definition.
'tic' can be an answer for 'twitch' (I've seen this before). I'm unsure of the 'somehow' bit.
'of a' is the link.
Can you help me to learn more?
(Other definitions for tic that I've seen before include "Twitch in analytical way" , "Convulsive twitch (of face)" , "Nervous twitch" , "Regular muscular twitch" , "Minor muscle spasm" .)