Longing to keep mum about misleading move in game (8)

I believe the answer is:

dummying

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'misleading move in game' is the definition.
I can't judge whether this defines the answer.

'longing to keep mum about' is the wordplay.
'longing' becomes 'dying' (dying is a kind of longing).
'to keep' indicates putting letters inside.
'about' indicates an anagram.
'mum' with letters rearranged gives 'umm'.
'dying' enclosing 'umm' is 'DUMMYING'.

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I've seen this clue in The Daily Mail.

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