Basic way to travel on earth (4,5)
I believe the answer is:
dirt track
'basic' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'way to travel on earth' is the wordplay.
'way' becomes 'track' (track is a kind of way).
'to' says to put letters next to each other (I've seen this in other clues).
'travel on earth' becomes 'dirt' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'track' after 'dirt' is 'DIRT-TRACK'.
Can you help me to learn more?
(Other definitions for dirt track that I've seen before include "Unmade road" , "Unpaved cycle-race course" , "Motorcycle race circuit" .)