Friend runs away after suffering heart tremors (10)
I believe the answer is:
earthquake
'friend runs away' is the definition.
I can't judge whether this defines the answer.
'suffering heart tremors' is the wordplay.
'suffering' indicates an anagram.
'tremors' becomes 'quake' (I can't explain this - if you can you should give a lot more credence to this answer).
'heart' with letters rearranged gives 'earth'.
'earth'+'quake'='EARTHQUAKE'
'after' is the link.
Can you help me to learn more?
(Other definitions for earthquake that I've seen before include "Strong tremor" , "natural disaster" , "Seismic event" , "Violent tremor in ground" .)