Old coach reportedly cut away joint (7)
I believe the answer is:
hackney
'old coach reportedly' is the definition.
I can't tell whether this definition defines the answer.
'cut away joint' is the wordplay.
'cut' becomes 'hack' (hack can mean to cut or chop).
'away joint' becomes 'ney' (I can't justify this - if you can you should believe this answer much more).
'hack'+'ney'='HACKNEY'
Can you help me to learn more?
(Other definitions for hackney that I've seen before include "district of London" , "Old cab - London borough" , "Wear out" , "draught horse" , "Carriage for hire" .)