Big-picture, ultimately utilitarian European leader (6)
I believe the answer is:
macron
'european leader' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'big-picture ultimately utilitarian' is the wordplay.
'big picture' becomes 'macro' (as in a macrocosm, as opposed to micro).
'ultimately' indicates one should take the final letters.
The final letter of 'utilitarian' is 'n'.
'macro'+'n'='MACRON'
Can you help me to learn more?
(Another definition for macron that I've seen is " French president".)