Bad lies about very bad things (5)
I believe the answer is:
evils
'bad things' is the definition.
(I've seen this in another clue)
'bad lies about very' is the wordplay.
'bad' indicates an anagram.
'about' means one lot of letters goes inside another.
'very' becomes 'v' (common abbreviation).
'lies' is an anagram of 'eils'.
'eils' placed around 'v' is 'EVILS'.
(Other definitions for evils that I've seen before include "Iniquities" , "Lives (anag.)" , "transgressions" , "immoral actions" , "Sins and depravities" .)