Pleasant smell of one finishing on the toilet (8)
I believe the answer is:
lavender
'pleasant' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I can't see?
'smell of one finishing on the toilet' is the wordplay.
'smell of one finishing' becomes 'ender' (I can't explain this - if you can you should believe this answer much more).
'on' says to put letters next to each other.
'the toilet' becomes 'lav' (lavatory).
'ender' put after 'lav' is 'LAVENDER'.
Can you help me to learn more?
(Other definitions for lavender that I've seen before include "Delicate perfume from shrub with purple leaves" , "Plant with aromatic purple flowers" , "Fragrant plant" , "Fragrant shrub (taking water?)" , "Plant prized for its scent" .)