Put foot down like a letter perhaps (7)
I believe the answer is:
stamped
'put foot down like a letter perhaps' is the definition.
I can't judge whether this definition defines the answer.
'put foot down like a letter' is the wordplay.
I cannot really understand how this works, but
'foot' could be 'stamp' (stamping is a kind of footing) and 'stamp' is found in the answer.
'down' could be 'd' and 'd' is found in the answer.
'letter' could be 'e' and 'e' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for stamped that I've seen before include "Impressed" , "trampled" , "Walked noisily or angrily" , "made an impression" , "Brought the foot down loudly" .)