Shook with fear and ran after first of Trump's Republican election messages (8)
I believe the answer is:
trembled
'shook with fear' is the definition.
(I've seen this before)
'ran after first of trump's republican election messages' is the wordplay.
'ran' becomes 'bled' ('bleed' can be a synonym of 'run'**).
'after' means one lot of letters go next to another.
'first of' indicates taking the first letters.
The first letters of 'trumps republican election messages' is 'trem'.
'bled' put after 'trem' is 'TREMBLED'.
'and' is the link.
(Other definitions for trembled that I've seen before include "shivered" , "Shook involuntarily" , "Shook from fear or cold" .)