Doctor enters hurriedly, pursuing one ointment (9)

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

'doctor enters hurriedly pursuing one' is the wordplay.
I cannot quite see how this works, but
'doctor' could be 'mo' (medical officer) and 'mo' is found in the answer.
an anagram of 'enters' is 'stener' which is located in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?