In first place, although really only maybe by a nose (5)

I believe the answer is:

aroma

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

'a nose' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for aroma that I've seen before include "Stink" , "Bouquet" , "Pervasive quality" , "A pleasant smell as of food" , "Pervasive atmosphere" .)

I've seen this clue in The Telegraph.

Want a hint initially instead of a full solution? Install my app