Line produced by cartographers primarily, going from place to place (7)
I believe the answer is:
contour
'line' is the definition.
(I know that contour is a type of isometric)
'by cartographers primarily going from place to place' is the wordplay.
'by' says to put letters next to each other.
'primarily' suggests taking the first letters.
'going from place to place' becomes 'on tour' (I've seen this before).
The initial letter of 'cartographers' is 'c'.
'c' put next to 'ontour' is 'CONTOUR'.
'produced' acts as a link.
(Other definitions for contour that I've seen before include "Map line of equal altitude" , "Outline, shape" , "Line on map indicating height" , "Silhouette" , "Defining line" .)