Expose wrongdoing and put a stop to a game? (4,3,7)
I believe the answer is:
blow the whistle
'expose wrongdoing' is the definition.
(I've seen this in another clue)
'put a stop to a game?' is the wordplay.
I cannot quite understand how this works, but
'game?' could be 'whist' (whist is a card game) and 'whist' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'and' is the link.
Can you help me to learn more?
(Other definitions for blow the whistle that I've seen before include "as a referee will" , "Expose a wrongdoing" .)