Put one’s foot down hard over European charge (8)
I believe the answer is:
stampede
'charge' is the definition.
(I've seen this before)
'put one's foot down hard over european' is the wordplay.
'put one's foot down hard' becomes 'stamped' (to stamp one's foot is to put it down hard).
'over' means one lot of letters go next to another (in a down clue, some letters go over others).
'european' becomes 'E' (abbreviation e.g. EU).
'stamped'+'e'='STAMPEDE'
(Other definitions for stampede that I've seen before include "Panic-driven rush of herd of animals" , "Neat rush" , "uncontrolled flight" , "Sudden rush of a panicstricken herd" , "Rampage" .)