Leaves Switzerland after ride towards Aargau's capital (7)
I believe the answer is:
spinach
'leaves' is the definition.
(leafy vegetable)
'switzerland after ride towards aargau's capital' is the wordplay.
'switzerland' becomes 'ch' (short for Confoederatio Helvetica, its Latin name).
'after' says to put letters next to each other.
'ride' becomes 'spin' (I've seen this in another clue).
'towards' means one lot of letters go next to another (I've seen this in other clues).
'capital' indicates taking the first letters.
The initial letter of 'aargaus' is 'a'.
'spin'+'a'='spina'
'ch' put after 'spina' is 'SPINACH'.
(Other definitions for spinach that I've seen before include "Vegetable leaves" , "Popeye the Sailor's favourite vegetable" , "leaves on plate?" , "something to eat" , "Vegetable plant" .)