Artless member trapped in web of lies (6)
I believe the answer is:
Here is my best explanation:
'artless' is the definition.
('simple' can be similar in meaning to 'artless')
'member trapped in web of lies' is the wordplay.
'member' becomes 'mp'.
'trapped in' is an insertion indicator.
'web of lies' becomes 'sile' (I can't justify this - if you can you should give a lot more credence to this answer).
'mp' inserted within 'sile' is 'SIMPLE'.
Can you help me to learn more?