Sarah travelled a wasteland (6)
I believe the answer is:
sahara
'wasteland' is the definition.
(I've seen this in another clue)
'sarah travelled a' is the wordplay.
'travelled' indicates anagramming the letters.
'sarah' anagrammed gives 'sahar'.
'sahar'+'a'='SAHARA'
(Other definitions for sahara that I've seen before include "World's largest desert" , "Great African desert" , "North African desert" , "Uncultivated region of north Africa" , "Great desert in N Africa" .)