Old, gloomy, unpleasant aroma (5)

I believe the answer is:

odour

I'm a little stuck... Click here to teach me more about this clue!

'unpleasant aroma' is the definition.
'odour' can be an answer for 'aroma' (synonyms). I'm not sure about the 'unpleasant' bit.

'old gloomy' is the wordplay.
'old' becomes 'o' (abbreviation as in OT - Old Testament).
'gloomy' becomes 'dour' (I've seen this before).
'o'+'dour'='ODOUR'

Can you help me to learn more?

(Other definitions for odour that I've seen before include "Whiff" , "Smell, redolence" , "Stink" , "Nasty smell" , "reputation" .)

I've seen this clue in The Daily Express.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.