Divides (8)
'divides' is the definition.
(segmenting is a kind of dividing)
This is all the clue.
(Other definitions for segments that I've seen before include "Nets gems in separate parts" , "Parts, pieces, portions" , "Portions or divisions, as of grapefruit" , "Divides or splits up" , "'Sections, pieces (8)'" .)
'divides' is the definition.
('part' can be a synonym of 'divide')
This is all the clue.
(Other definitions for parts that I've seen before include "bits" , "Components of strap" , "Leaves" , "Areas" , "Strap (anag.)" .)