Record keeper (5)
(Other definitions for registrar that I've seen before include "Official record keeper" , "Official record-keeper" , "Mid-ranking doctor" , "Keeper of official records - hospital doctor" , "University official" .)
This might be a double definition.
'record' is the first definition.
(I have seen 'best record' mean 'number one' so perhaps 'record' could also mean 'number one')
'keeper?' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
Can you help me to learn more?
(Other definitions for number one that I've seen before include "officer on board?" , "Naval first lieutenant; foremost person/thing" , "leader" , "top-selling record" , "the most important person" .)
'record keeper' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for clerk that I've seen before include "Record-keeper" , "Court record keeper" , "Office record keeper" , "Office/bank worker" , "Office worker (UK) - shop assistant (US)" .)