Jump a line to reach limit (8)
I believe the answer is:
boundary
'limit' is the definition.
('boundary' can be a synonym of 'limit')
'jump a line' is the wordplay.
'jump' becomes 'bound' (bound is a kind of jump).
'line' becomes 'ry' (abbreviation for railway).
'bound'+'a'+'ry'='BOUNDARY'
'to reach' is the link.
(Other definitions for boundary that I've seen before include "4 possibly" , "Frontier" , "line between states" , "Border (especially in cricket)" , "march" .)