Smart person wiping chlorine from part of fingernail (5)
I believe the answer is:
cutie
'smart person wiping chlorine' is the definition.
I can't judge whether this definition defines the answer.
'part of fingernail' is the wordplay.
'part' becomes 'cut' (cutting is a kind of parting).
'of fingernail' becomes 'ie' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cut'+'ie'='CUTIE'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for cutie that I've seen before include "an attractive thing" , "lovely" , "Appealing young lady" , "beauty" , "Attractive girl" .)