The most common and most likely answer to this crossword clue is the 4 plus 4 letter word GOLD RUSH
I've seen this crossword clue in Financial Times
G
O
L
D
R
U
S
H
More clues leading to the result GOLD RUSH
- Good getting on high-priority film
- Large-scale migration for those seeking earthly riches
- Large scale migration for those seeking earthly riches
- Reason why drunk lord enters stream to seek his fortune?
- Lots of prospects after this good antique career?
- During which there’s the prospect of hidden riches?
- Copious issue involving former S. African currency in quest for easy money
Buddy explains!

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.