Trendy revolutionary dropped by friendly set (7)
I believe the answer is:
congeal
'set' is the definition.
(I know that set can be written as congeal)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for congeal that I've seen before include "Become semi-solid like cooling grease" , "Become gelatinous" , "Set - go clean (anag)" , "Clot" , "Coagulate" .)