Coin Europeans must invest in school (7)
I believe the answer is:
educate
'school' is the definition.
(I know that school can be written as educate)
'coin europeans must invest' is the wordplay.
I cannot really see how this works, but
'coin' could be 'ducat' (ducat is a kind of coin) and 'ducat' is found in the answer.
'europeans' could be 'ee' (an abbreviation for European written twice) and 'ee' is found in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'in' is the link.
Can you help me to learn more?
(Other definitions for educate that I've seen before include "Team" , "Train, teach" , "Teach - school" , "what teacher should do, to be effective" , "Impart learning" .)