It's bad to be overthrown (4)
I believe the answer is:
evil
'it's bad' is the definition.
(associated in meaning)
'be overthrown' is the wordplay.
'be' becomes 'live' (to be is to live or exist).
'overthrown' is a reversal indicator.
'live' in reverse letter order is 'EVIL'.
'to' acts as a link.
(Other definitions for evil that I've seen before include "Live (anag.)" , "Morally wrong" , "Vile (anag) -- really bad" , "Villainy" , "Morally objectionable behavior" .)