Trump's slogan inspiring Liberal graduate to join revolutionary Union (7)
I believe the answer is:
amalgam
'union' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'trump's slogan inspiring liberal graduate to join revolutionary' is the wordplay.
'trump's slogan' becomes 'MAGA' ('Make America Great Again' - Donald Trump phrase).
'inspiring liberal graduate' becomes 'lam' (I am not sure about this - if you are sure you should believe this answer much more).
'to join' means one lot of letters goes inside another (inserted letters join the word).
'revolutionary' is a reversal indicator (letters revolve around).
'maga' going around 'lam' is 'maglama'.
'maglama' in reverse letter order is 'AMALGAM'.
Can you help me to learn more?
(Other definitions for amalgam that I've seen before include "combination of things" , "Mixture (for dental fillings)" , "often filling" , "Ring-bearing hobbit" , "Blend of diverse things" .)