A doctor's name (4)

I believe the answer is:

amos

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'name' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'a doctor's' is the wordplay.
'doctor's' becomes 'mo's' (medical officer).
'a'+'mos'='AMOS'

Can you help me to learn more?

(Other definitions for amos that I've seen before include "Old Testament prophet" , "Part of bible" , "Old Testament book" , "Prophet in the Bible" , "man" .)

I've seen this clue in The Globe and Mail.

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