Being a sport, send quick message to practise at first on golf (4-4)
I believe the answer is:
ping-pong
'being a sport send quick message' is the definition.
I can't judge whether this definition defines the answer.
'to practise at first on golf' is the wordplay.
'to' becomes 'ping' (I can't justify this - if you can you should give a lot more credence to this answer).
'at first' indicates taking the first letters.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
The initial letter of 'practise' is 'p'.
'ping'+'p'+'on'+'g'='PING-PONG'
Can you help me to learn more?
(Other definitions for ping-pong that I've seen before include "27 ac tennis" , "Sport played on a table" , "Table-top game" , "A type of table tennis" .)