Dramatist succeeded: your compiler's in business! (5)
I believe the answer is:
simon
'dramatist' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's an association between them I don't understand?
'succeeded your compiler's in business' is the wordplay.
'succeeded' becomes 's' (genealogical abbreviation).
'your compiler's' becomes 'I'm' ('your compiler' refers to the crossword compiler).
'in business' becomes 'on' (I can't explain this - if you can you should give a lot more credence to this answer).
's'+'im'+'on'='SIMON'
Can you help me to learn more?
(Other definitions for simon that I've seen before include "Man's name" , "Bolivar, de Montfort, Callow or Cowell?" , "A simple character in nursery rhyme" , "Sir -- Rattle, conductor" , "he says it's a game" .)