One holding stock in branch erroneously (7)
I believe the answer is:
rancher
'one holding stock' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'in branch erroneously' is the wordplay.
'in' indicates the answer is hidden within the clue.
'RANCHER' is hidden in the letters of 'branch erroneously'.
Can you help me to learn more?
(Other definitions for rancher that I've seen before include "Owner of a large farm" , "A cowboy" , "North American cattle farmer" , "US cattle farmer" , "Hacienda owner" .)