Wishing for ride, so tour America (8)
I believe the answer is:
desirous
'wishing for' is the definition.
(I've seen this in another clue)
'ride so tour america' is the wordplay.
'tour' indicates anagramming the letters (I've seen 'tours' mean this (the letters roam or tour around)).
'america' becomes 'US' (United States).
'ride'+'so'='rideso'
'rideso' is an anagram of 'desiro'.
'desiro'+'us'='DESIROUS'
(Other definitions for desirous that I've seen before include "Wishful, wanting" , "Ready" .)