Doctor and MA having part in complex procedure (9)
I believe the answer is:
rigmarole
'complex procedure' is the definition.
(I've seen this before)
'doctor and ma having part' is the wordplay.
'doctor' becomes 'rig' (I've seen this before).
'and' means one lot of letters go next to another.
'having part' becomes 'role' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rig'+'ma'+'role'='RIGMAROLE'
'in' acts as a link.
(Other definitions for rigmarole that I've seen before include "Long, complicated and confusing procedure" , "boring series" , "Complicated business" , "Long, rambling statement or complicated procedure" , "Rambling account" .)