Well over square-bashing in east European footwear (10)
I believe the answer is:
espadrille
'footwear' is the definition.
(I know that espadrille is a type of shoe)
'well over square-bashing in east european' is the wordplay.
'well' becomes 'spa' (both can mean a spring or water source).
'over square-bashing' becomes 'drill' (I've seen this before. I am not sure about the 'over' bit.).
'in' indicates putting letters inside.
'east european' becomes 'EE' (abbreviation).
'spa'+'drill'='spadrill'
'spadrill' placed into 'ee' is 'ESPADRILLE'.
Can you help me to learn more?
(Other definitions for espadrille that I've seen before include "Light rope-soled shoe" , "[SHOE], made casually" , "goes on foot" , "Footwear" , "sandal!" .)