Come to understand lies are wrong (7)
I believe the answer is:
realise
'come to understand' is the definition.
(I've seen this before)
'lies are wrong' is the wordplay.
'wrong' indicates anagramming the letters.
'lies'+'are'='liesare'
'liesare' is an anagram of 'REALISE'.
(Other definitions for realise that I've seen before include "Come to be aware" , "Become aware of as a fact" , "Become aware of something" , "net" , "Be fully aware of or convert plan into fact" .)