Scots head key large mountain university in Europe (10)
I believe the answer is:
heidelberg
'university in europe' is the definition.
'scots head key large mountain' is the wordplay.
'scots head' becomes 'heid' (Scottish dialect for 'head').
'key' becomes 'e' (I've seen this in other clues).
'large' becomes 'l'.
'mountain' becomes 'berg' (I've seen this before**).
'heid'+'e'+'l'+'berg'='HEIDELBERG'
(Other definitions for heidelberg that I've seen before include "setting for The Student Prince" , "German town" , "German university" .)