Out West, a small person may be called a little jerk (6)
I believe the answer is:
twitch
'jerk' is the definition.
(synonyms)
'out west a small person may be called a little' is the wordplay.
I cannot really understand how this works, but
'west' could be 'w' (abbreviation) and 'w' is found in the answer.
'small person' could be 'titch' (titch can informally mean a short person) and 'titch' is located in the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for twitch that I've seen before include "Spasmodic jerk" , "Pang; small noose" , "Jerk suddenly" , "Quiver or contract spasmodically, as eye may" , "Move uncontrollably - watch birds" .)