Frowning, following ocelot's initial scent (5)
I believe the answer is:
odour
'scent' is the definition.
(I know that scent can be written as odour)
'frowning following ocelot's initial' is the wordplay.
'frowning' becomes 'dour' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'following' says to put letters next to each other.
'initial' says to take the initial letters.
The initial letter of 'ocelots' is 'o'.
'dour' after 'o' is 'ODOUR'.
Can you help me to learn more?
(Other definitions for odour that I've seen before include "Aroma, smell" , "reputation" , "Smell; repute" , "for the nose to detect" , "Small, aroma" .)