Wisdom about current in French river (5)
I believe the answer is:
loire
'french river' is the definition.
(River Loire)
'wisdom about current in' is the wordplay.
'wisdom' becomes 'lore' (I've seen this before).
'about current' becomes 'i' (symbol for electric current. I am not sure about the 'about' bit.).
'in' is an insertion indicator.
'lore' enclosing 'i' is 'LOIRE'.
Can you help me to learn more?
(Other definitions for loire that I've seen before include "Longest French river" , "River flowing through Tours and Nantes" , "River of central France" , "flower abroad" , "French runner" .)