Evening picnics on the rail route are on the list (7)
I believe the answer is:
incline
'the list' is the definition.
(list can mean to lean or roll)
'evening picnics on the rail route are' is the wordplay.
I cannot really understand how this works, but
'route' could be 'line' (line is a kind of route) and 'line' is found within the answer.
This explanation may well be incorrect...
'on' acts as a link.
Can you help me to learn more?
(Other definitions for incline that I've seen before include "Have a tendency to do or be something" , "tip" , "Bend forwards" , "Gradient" , "Be disposed to" .)