A bit of luck during the hitting of the ball? (6)

I believe the answer is:

stroke

I'm a little stuck... Click here to teach me more about this clue!

'a bit' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

(Other definitions for stroke that I've seen before include "Attack suffered by a rower?" , "It's caused by interruption in blood-flow to the brain" , "One of eight" , "breast, for one" , "Attack of paralysis found in a boat?" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.