The most common and most likely answer to this crossword clue is the 8 letter word FOREHAND
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Buddy explains!
The straight part
We know that "Federer's groundstroke for one" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case federer's groundstroke for one = forehand.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 FOREHAND mean?
FOREHAND noun- (racket sports) A stroke in which the palm of the hand faces the direction of the stroke.
- (disc sports) A throw similar to a sidearm throw in baseball, where the disc remains on the throwing-arm side of the body and is led by the middle finger.
- All of the part of a horse which is before the rider.
- The chief or most important part.
- Superiority; advantage; start; precedence.
- The hand towards the front of the board.
- To strike with a forehand stroke.
- Beforehand; paid in advance.