Playing this, one might be putting upsetting record on loudly (4)
I believe the answer is:
golf
'playing this one might be' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'upsetting record on loudly' is the wordplay.
'upsetting' says the letters should be written in reverse.
'record' becomes 'log' (log is a kind of record).
'on' is a charade indicator (letters next to each other).
'loudly' becomes 'f' (short for forte - 'loud' in music).
'log' reversed gives 'gol'.
'gol'+'f'='GOLF'
'putting' is the link.
Can you help me to learn more?
(Other definitions for golf that I've seen before include "Code word for the letter G" , "Game with clubs" , "Game with tees" , "Something played" , "To some, it's a good walk spoiled" .)