One generous with his political opinions? (7)
I believe the answer is:
liberal
'one generous' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for liberal that I've seen before include "Ample; former politician" , "(Of quantities) generous" , "Permissive about Braille" , "Lavish" , "Favouring individual freedoms" .)