The most common and most likely answer to this crossword clue is the 8 letter word WALKOVER
I've seen this crossword clue in The Daily Telegraph
W
A
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Buddy explains!

The straight part
We know that "easy win" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case easy win = walkover.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 WALKOVER mean?
WALKOVER noun- An easy victory; a walkaway.
- A bye or victory awarded to a competitor when a scheduled opponent fails to play a game.
- A horse race with only one entrant.
- Someone easy to defeat.
- A backbend combined with a handstand.
- A type of railroad passenger car seat, having reversible seat backs that can be moved across the seat to face either direction of travel
- An ecological survey carried out by walking across and examining a piece of land.