Finished first in division one (4)
I believe the answer is:
'finished' is the definition.
(I've seen this before)
'first in division one' is the wordplay.
'first in' says to take the initial letters.
The initial letter of 'division' is 'd'.
(Other definitions for done that I've seen before include "that may be said to seal a deal" , "This settled" , "Artist's workroom" , "Swindled" , "Tricked" .)