Wander across where the last shall be first (4)
I believe the answer is:
rove
'wander' is the definition.
(synonyms)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for rove that I've seen before include "Move aimlessly about" , "Don't stay in one place" , "Knock about" , "Range" , "Ramble, roam, wander" .)