It’s a nasty, concerning, scornful piece of work (6)
I believe the answer is:
satire
'work' is the definition.
(I've seen this before)
'it's a nasty concerning' is the wordplay.
'nasty' indicates an anagram (a nasty or wrong spelling).
'concerning' becomes 're' (both can mean on a particular topic).
'its'+'a'='itsa'
'itsa' is an anagram of 'sati'.
'sati'+'re'='SATIRE'
'scornful piece of' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for satire that I've seen before include "text of Juvenal" , "work with cutting devices?" , "Jonathan Swift's forte?" , "Irony or sarcasm in speech or writing" , "Mocking humour" .)