A hospital doctor who might marry you? (9)
I believe the answer is:
registrar
'a hospital doctor' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for registrar that I've seen before include "certifies births and deaths" , "Official recorder" , "Keeper of official records - hospital doctor" , "Official record keeper" , "clerk" .)