Crossword Genius

A hospital doctor who might marry you? (9)

Ross

I believe the answer is:

registrar

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Times.
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