Con artist forged line drawings, without gain (8)
I believe the answer is:
swindler
'con artist' is the definition.
(I've seen this in another clue)
'forged line drawings without gain' is the wordplay.
'forged' is an anagram indicator.
'without' indicates named letters should be taken away.
'line'+'drawings'='linedrawings'
'linedrawings' with 'gain' taken away is 'ledrwins'.
'ledrwins' is an anagram of 'SWINDLER'.
(Other definitions for swindler that I've seen before include "Fraudster" , "Con man" , "Con artist" , "Trickster" , "Fraudulent person or cheat" .)