Tory leader fills political address with extremely nebulous ideas (7)
I believe the answer is:
notions
'ideas' is the definition.
(notion is a kind of idea)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for notions that I've seen before include "Thoughts" , "Fanciful feelings" , "Vague ideas" , "Whims, ideas or small personal articles" , "Fanciful or capricious ideas" .)