Separate odd bits of sledge or sleigh intended for delivery (7)
I believe the answer is:
segment
'separate' is the definition.
(segmenting is a kind of separating)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for segment that I've seen before include "Part of citrus fruit" , "One part of a whole" , "(Divided-up) part" , "Portion" , "Part, piece" .)