Group of swingers whip contrary, line-crossing noob (4,4)
I believe the answer is:
golf club
'group' is the definition.
The answer is an example.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for golf club that I've seen before include "Wood, possibly" , "Driver or wood, say" , "Sporting wood or iron" , "Driver or putter, say" , "Baghdad its capital" .)