The most common and most likely answer to this crossword clue is the 6 plus 7 letter word EDMUND HILLARY
E
D
M
U
N
D
H
I
L
L
A
R
Y
More clues leading to the result EDMUND HILLARY
Buddy explains!
The straight part
We know that "He’s abroad and on peak, carrying through dream to crack what’s unknown" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case he’s abroad and on peak, carrying through dream to crack what’s unknown = edmund hillary.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.