Hospital doctor injecting point right in centre of back (9)
I believe the answer is:
registrar
'hospital doctor' is the definition.
(I've seen this before)
'injecting point right in centre of back' is the wordplay.
I cannot quite see how this works, but
'point' could be 'gist' (I've seen this before) and 'gist' is located in the answer.
'right' could be 'r' (common abbreviation) and 'r' is present in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for registrar that I've seen before include "Official record-keeper" , "Recorder of births, deaths and marriages" , "certifies births and deaths" , "Record keeper - hospital doctor" , "Official record keeper" .)