Crossword Genius

Didn't take seriously a delay apt to cause havoc (6,2)

Ross

I believe the answer is:

played at

I'm a little stuck... Click here to teach me more about this clue!

'didn't take seriously a' is the definition.
I can't judge whether this definition defines the answer.

'delay apt to cause havoc' is the wordplay.
'delay apt' can be anagrammed to 'PLAYED AT'.
But, I am unsure how this is indicated.

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