Remaining exam taken again — with the time cut — in two parts (8)

I believe the answer is:

residual

But I can't explain it at all!

(Other definitions for residual that I've seen before include "Leftover; repeat royalty" , "Pertaining to what is left over" , "'Remaining, left over (8)'" , "unused" , "Leftover - used rail (anag)" .)

I've seen this clue in The Times.

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