I'm not telling lies: players made blunders (2,4,3,6)
I believe the answer is:
my lips are sealed
'i'm not telling' is the definition.
I can't tell whether this defines the answer.
'lies players made blunders' is the wordplay.
'blunders' indicates anagramming the letters.
'lies'+'players'+'made'='liesplayersmade'
'liesplayersmade' with letters rearranged gives 'MY LIPS ARE SEALED'.
Can you help me to learn more?
(Other definitions for my lips are sealed that I've seen before include "I can't say" , "I won't say a word" , "I'll keep mum" .)