A doctor with oxygen — it is nifty (6)
I believe the answer is:
adroit
'nifty' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?
'a doctor with oxygen aeur it' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
'doctor' could be 'dr' (abbreviation) and 'dr' is located in the answer.
'oxygen' could be 'o' (atomic symbol for oxygen) and 'o' is present in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
A single letter 'i' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'is' is the link.
Can you help me to learn more?
(Other definitions for adroit that I've seen before include "Skilful, expert" , "Skilful, dexterous" , "Dextrous" , "resourceful" , "Skilled" .)