The most common and most likely answer to this crossword clue is the 4 plus 5 letter word HIGH FIVES
I've seen this crossword clue in The Times
H
I
G
H
F
I
V
E
S
More clues leading to the result HIGH FIVES
Buddy explains!
The straight part
We know that "Hands up for success" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hands up for success = high fives.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.
What does HIGH FIVES mean?
HIGH FIVES noun- A gesture of celebration or victory in which two people slap their hands together at shoulder height or higher.
- The game of cinch.
- To slap high fives.