Ruled reply, we hear, required for one taking set steps (4,6)
I believe the answer is:
line dancer
'for one taking set steps' is the definition.
'ruled reply we hear' is the wordplay.
I cannot quite understand how this works, but
'ruled' could be 'lined' (I've seen this before) and 'lined' is present in the answer.
This may be the basis of clue (or it may be nonsense).
'required' acts as a link.
(Other definitions for line dancer that I've seen before include "one accompanied by country music?" , "Astonishing tightrope performer" .)