Feeling movement after onset of earthquake (7)
I believe the answer is:
emotion
'feeling' is the definition.
(I know that emotion is a type of feeling)
'movement after onset of earthquake' is the wordplay.
'movement' becomes 'motion' (synonyms).
'after' says to put letters next to each other.
'onset of' indicates taking the first letters.
The first letter of 'earthquake' is 'e'.
'motion' put after 'e' is 'EMOTION'.
(Other definitions for emotion that I've seen before include "E.g. fear, hate etc." , "Strong feeling of joy, fear etc" , "Feeling like love or fear" , "Anger, perhaps" , "A strong instinctive feeling" .)