The most common and most likely answer to this crossword clue is the 8 letter word VANTAGES
I've seen this crossword clue in The Guardian
V
A
N
T
A
G
E
S
Buddy explains!

The straight part
We know that "benefits" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case benefits = vantages.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 VANTAGES mean?
VANTAGES noun- Any condition, circumstance, opportunity or means, particularly favorable to success, or to any desired end.
- Superiority; mastery; — used with of to specify its nature or with over to specify the other party.
- Superiority of state, or that which gives it; benefit; gain; profit
- The score where one player wins a point after deuce but needs the next to carry the game.
- The continuation of the game after a foul against the attacking team, because the attacking team are in an advantageous position.
- Interest of money; increase; overplus (as the thirteenth in the baker's dozen).
- An advantage.
- A place or position affording a good view; a vantage point.
- A superior or more favorable situation or opportunity; gain; profit; advantage.