The most common and most likely answer to this crossword clue is the 3 letter word TIC
I've seen this crossword clue in The Times
T
I
C
More clues leading to the result TIC
- Movement perceived in previous answer?
- Minor physical problem: temperature very low?
- Brief moment for twitch
- Latter half of erotic spasm
- Twitch irregularly — or regularly — with this
- Diplomacy round breaks ice after time in game Yanks play
- Little jerk not quite recalling quote
- Contraction of credit, we hear, can be painful
- Sign of nerves in a politician
- Twitch, seen every so often?
Buddy explains!

The straight part
We know that "Movement" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case movement = tic.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TIC mean?
TIC noun- A sudden, nonrhythmic motor movement or vocalization.
- (by extension) Something that is done or produced habitually or characteristically.
- (abbreviation) ticket
- To exhibit a tic; to undergo a sudden, semi-voluntary muscle movement.