Quiet pub found by a Conservative, 50, before European summit (8)
I believe the answer is:
pinnacle
'european summit' is the definition.
'pinnacle' can be an answer for 'summit' (pinnacle is a kind of summit). I am unsure of the 'european' bit.
'quiet pub found by a conservative 50' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'pub' becomes 'inn' (an inn is a type of pub).
'found by' means one lot of letters go next to another.
'conservative 50' becomes 'cle' (I can't explain this - if you can you should give a lot more credence to this answer).
'p'+'inn'+'a'+'cle'='PINNACLE'
'before' is the link.
Can you help me to learn more?
(Other definitions for pinnacle that I've seen before include "Highest point (of fame or building)" , "Acme" , "tip-top" , "The highest point, summit" , "Apex" .)