Feeling movement following onset of earthquake (7)
I believe the answer is:
emotion
'feeling' is the definition.
(emotion is a kind of feeling)
'movement following onset of earthquake' is the wordplay.
'movement' becomes 'motion' (synonyms).
'following' is a charade indicator (letters next to each other).
'onset of' says to take the initial letters.
The first letter of 'earthquake' is 'e'.
'motion' after 'e' is 'EMOTION'.
(Other definitions for emotion that I've seen before include "Feeling like love or fear" , "Fear possibly" , "sense" , "Mental feeling" , "Anger, perhaps" .)