Clue: Drive on the left or right (8)
Answer: FOREHAND
Explanation: Drive on the left or right (8) 
A tennis shot which could be played with the left or right hand, or indeed both.
 
The clue isn't specific enough for my liking, (a forehand doesn't need to be a drive (could be a lob, a drop shot etc)) and requires checking letters (could just as easily be backhand). 
 
Again, you need to realise that the crossword has a theme for this one to work.