Fly with management, a feature of which is doubles all round! (9)
I believe the answer is:
dartboard
'fly with management a feature of which is doubles all round' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'fly with management' is the wordplay.
'fly' becomes 'dart' (I can't explain this - if you can you should give a lot more credence to this answer).
'with' is a charade indicator (letters next to each other).
'management' becomes 'board' (eg the board managing a business).
'dart'+'board'='DARTBOARD'
Can you help me to learn more?
(Other definitions for dartboard that I've seen before include "Target for arrows" , "It's doubles all round" , "Pub game equipment" , "Target found in pubs" .)