They provide late entertainment - black suit required after dark (10)
I believe the answer is:
nightclubs
'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps they are linked in a way I don't understand?
'late entertainment black suit required after dark' is the wordplay.
'late' indicates one should take the final letters (I've seen 'latest of' mean this).
'black suit' becomes 'clubs' (I've seen this in another clue).
'required' says to put letters next to each other.
'after' means one lot of letters go next to another.
'dark' becomes 'nigh' (I can't explain this - if you can you should give a lot more credence to this answer).
The last letter of 'entertainment' is 't'.
't' next to 'clubs' is 'tclubs'.
'tclubs' after 'nigh' is 'NIGHTCLUBS'.
'provide' acts as a link.
Can you help me to learn more?
(Another definition for nightclubs that I've seen is " entertaining here?".)