Show contempt for doctor, conveyed by digital signal (6)
I believe the answer is:
'show contempt for' is the definition.
(to bemock is to scorn or show contempt for)
'doctor conveyed by digital signal' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'conveyed by' is an insertion indicator.
'digital signal' becomes 'beck' (as in beckoning with fingers ie digits).
'mo' inserted into 'beck' is 'BEMOCK'.