Rage about heel, ultimately scheming type (6)
I believe the answer is:
angler
'scheming type' is the definition.
(somebody angling or scheming for something)
'rage about heel ultimately' is the wordplay.
'rage' becomes 'anger' (I've seen this before).
'about' means one lot of letters goes inside another.
'heel ultimately' becomes 'l' (I am not sure about this - if you are sure you should believe this answer much more).
'anger' enclosing 'l' is 'ANGLER'.
Can you help me to learn more?
(Other definitions for angler that I've seen before include "A rod-and-line fisherman" , "Fisher with hook and line." , "Walton's was Compleat" , "Sportsman" , "Hook and line fisherman" .)