Put one's foot down over energy charge (8)
I believe the answer is:
stampede
'charge' is the definition.
(I've seen this before)
'put one's foot down over energy' is the wordplay.
'put one's foot down' becomes 'stamp' (I've seen this in another clue).
'over energy' becomes 'ede' (I am not sure about this - if you are sure you should believe this answer much more).
'stamp'+'ede'='STAMPEDE'
Can you help me to learn more?
(Other definitions for stampede that I've seen before include "unstable flight" , "Pasted me (anag.)" , "Panic-stricken charge of cattle" , "Panicked rush (of cattle)" , "Disorderly rush" .)