Person not in good odour (7)
I believe the answer is:
stinker
'person' is the definition.
(stinker is a kind of person)
'not in good odour' is the wordplay.
I cannot quite understand how this works, but
'in' is within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for stinker that I've seen before include "Difficult problem" , "no easy thing" , "Terrible job" , "Very hard task" , "Unpleasant person - difficult task" .)