Imagine one being wise after endless sin (8)
I believe the answer is:
envisage
'imagine' is the definition.
(synonyms)
'one being wise after endless sin' is the wordplay.
'one' becomes 'en' (I can't explain this - if you can you should give a lot more credence to this answer).
'being wise' becomes 'sage' (similar in meaning).
'after' means one lot of letters go next to another.
'endless' says to take the centre.
'sin' becomes 'evil' (I've seen this before).
The middle of 'evil' is 'vi'.
'sage' put after 'vi' is 'visage'.
'en'+'visage'='ENVISAGE'
Can you help me to learn more?
(Other definitions for envisage that I've seen before include "Form a mental picture of (something)" , "Consider, contemplate" , "Conceive of, imagine" , "See" , "Contemplate, imagine" .)