Corresponding but never meeting (8)
I believe the answer is:
parallel
I believe this clue is a double definition.
'corresponding' is the first definition.
(I've seen this before)
'never meeting' is the second definition.
(I've seen this before)
'but' acts as a link.
(Other definitions for parallel that I've seen before include "Everywhere is equidistant and doesn't intersect" , "Imaginary line around the Earth" , "When lines are equidistant and never intersect" , "bars in gym?" , "Like" .)