Wave hard with horse-rider, heading off for sport (6,6)
I believe the answer is:
roller hockey
'sport' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'wave hard with horse-rider heading off' is the wordplay.
'wave' becomes 'roller' (roller is a kind of wave).
'hard' becomes 'h' (abbreviation used in pencil classifications).
'with' says to put letters next to each other.
'horse rider' becomes 'jockey' (I've seen this before).
'heading off' means to remove the first letter.
'jockey' with its first letter taken off is 'ockey'.
'roller'+'h'+'ockey'='ROLLER HOCKEY'
'for' is the link.
Can you help me to learn more?
(Another definition for roller hockey that I've seen is " game".)