Travel round Greek capital in the saddle (5)
I believe the answer is:
ridge
'the saddle' is the definition.
(I've seen this before)
'travel round greek capital' is the wordplay.
'travel' becomes 'ride' (eg to ride a bus).
'round' indicates putting letters inside.
'capital' says to take the initial letters.
The first letter of 'greek' is 'g'.
'ride' placed around 'g' is 'RIDGE'.
'in' is the link.
(Other definitions for ridge that I've seen before include "Line of higher ground" , "Narrow hill-range" , "Narrow hilltop range" , "Wrinkle" , "Raised earth between furrows" .)