Vulgarity endures sadly with first of sketches (8)
I believe the answer is:
rudeness
'vulgarity' is the definition.
(I've seen this before)
'endures sadly with first of sketches' is the wordplay.
'sadly with' indicates anagramming the letters.
'first of' says to take the initial letters.
The first letter of 'sketches' is 's'.
'endures' anagrammed with 's' gives 'RUDENESS'.
(Other definitions for rudeness that I've seen before include "Lack of courtesy or manners" , "Impolite behaviour" , "Bad manners, lack of politeness" , "Incivility" , "Vulgarity" .)