Clubs travelling round line shown on map (7)
I believe the answer is:
contour
'line shown on map' is the definition.
(type of line on a map)
'clubs travelling' is the wordplay.
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'travelling' becomes 'on tour' (on tour is a kind of travelling).
'c'+'ontour'='CONTOUR'
'round' is the link.
This may not be right. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for contour that I've seen before include "Defining line" , "Map line of equal altitude" , "Feature on map" , "Line on map indicating height" , "Outline, shape" .)