Lecture about skin (5)
I believe the answer is:
chide
'lecture' is the definition.
(I've seen this before)
'about skin' is the wordplay.
'about' becomes 'c' (abbreviation for 'circa').
'skin' becomes 'hide' ('hide' can be a synonym of 'skin').
'c'+'hide'='CHIDE'
(Other definitions for chide that I've seen before include "Censure, berate" , "Censure angrily" , "Santa's laugh" , "Seeing scold" , "Rebuke, scold" .)