Lobs' paths (4)
I believe the answer is:
arcs
'lobs' paths' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for arcs that I've seen before include "Parts of a circle" , "Portions of a circle" , "Segments of a circle" , "Streaks of electrical discharges" , "Cars (anag)" .)