All arranged to go into some unfinished race (6)
I believe the answer is:
slalom
'race' is the definition.
('slalom' means to move in a zigzag)
'all arranged to go into some unfinished' is the wordplay.
'arranged' is an anagram indicator.
'to go into' indicates putting letters inside (some letters go into others).
'unfinished' means to remove the last letter.
'all' anagrammed gives 'lal'.
'some' with its last letter removed is 'som'.
'lal' placed inside 'som' is 'SLALOM'.
(Other definitions for slalom that I've seen before include "Type of ski race" , "Downhill ski race over a winding course" , "Winter Olympic event" , "Downhill race over a winding course on skis" , "Skiing obstacle race" .)