Walk over hot stuff (5)
I believe the answer is:
march
'walk' is the definition.
(I know that march is a more specific form of the action the walk)
'over hot stuff' is the wordplay.
'over' says to put letters next to each other (in a down clue, some letters go over others).
'hot' becomes 'h' (abbreviation, eg on taps).
'stuff' becomes 'marc' (I can't explain this - if you can you should give a lot more credence to this answer).
'h' put after 'marc' is 'MARCH'.
Can you help me to learn more?
(Other definitions for march that I've seen before include "Stride; month" , "Spring" , "Moving demonstration" , "Military walk; month" , "that happens fairly early each year" .)