mega stinker no 92

I've got clout. While I'm here have you solved 79d "dappled cloud pattern" (8,3). The 3-letter word is obviously sky and for the 8 letters I've got n-c-e-e-. Can't get anything intelligent from Google.

You need MACKEREL SKY.

thankyou for your answer & i have the same answer with 79d as mackerel sky

Thanks for your help, and have realised that for 78a (small ancient Greek theatre) I had odeon which will now become odeum, so I'm all set. Cheers.