Emotion created by speed getting heart going (4)
I believe the answer is:
hate
'emotion' is the definition.
(hate is a kind of emotion)
'speed getting heart going' is the wordplay.
'speed' becomes 'haste' (haste is a kind of speed).
'getting heart going' means to remove the middle letters (the heart is the middle letter).
'haste' with its middle removed is 'HATE'.
'created by' acts as a link.
(Other definitions for hate that I've seen before include "Detest" , "Abominate" , "Intense emotion opposite to love" , "[OPPOSITE OF] Be besotted with" , "Odium" .)