Perhaps sinner and saint going out — they often meet in the dark (8)
I believe the answer is:
curtains
'perhaps sinner' is the definition.
I can't tell whether this defines the answer.
'saint going out they often meet in the dark' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'saint' is 'tains' which is located in the answer.
The remaining letters 'cur' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'and' is the link.
Can you help me to learn more?
(Other definitions for curtains that I've seen before include "It could be the end" , "Hanging drapes" , "I run cats up the drapes" , "Hanging cloths" , "Window coverings" .)