Figures taking lead parts in original Nine Enchanted Stags (4)
I believe the answer is:
ones
'figures' is the definition.
(one is a number or figure)
'lead parts in original nine enchanted stags' is the wordplay.
'lead parts in' says to take the initial letters (the letters which lead the words).
The first letters of 'original nine enchanted stags' is 'ONES'.
'taking' is the link.
(Other definitions for ones that I've seen before include "(Of ship) returning to port of origin" , "Singles" , "Singletons" , "Individuals" , "Aces" .)