Group skilfully limiting upturn in chaos (8)
I believe the answer is:
assembly
'group' is the definition.
(assembly is a kind of group)
'skilfully limiting upturn in chaos' is the wordplay.
'skilfully' becomes 'ably'.
'limiting' means one lot of letters goes inside another.
'upturn in' says the letters should be written in reverse.
'chaos' becomes 'mess' (I've seen this before).
'mess' backwards is 'ssem'.
'ably' placed around 'ssem' is 'ASSEMBLY'.
(Other definitions for assembly that I've seen before include "Meeting; fabrication" , "synod" , "Religious gathering" , "Legislative gathering" , "court" .)