Put foot down on a T-bar (4)
I believe the answer is:
trod
'put foot down on a t-bar' is the definition.
I can't judge whether this defines the answer.
'on a t-bar' is the wordplay.
'on' is a charade indicator (letters next to each other).
'bar' becomes 'rod' (both can mean a pole or stick).
't'+'rod' is 'TROD'.
Can you help me to learn more?
(Other definitions for trod that I've seen before include "Walked heavily, put foot down" , "Stepped heavily" , "Took steps" , "Pressed (something) down with the feet" , "Walked (on something)" .)