In poor taste to have ministry ultimately moving back to some coal plant production (3,3)

I believe the answer is:

fly ash

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'moving back to some coal plant production' is the definition.
I can't tell whether this defines the answer.

'in poor taste to have ministry ultimately' is the wordplay.
'in poor taste' becomes 'flash' (similar in meaning).
'to have' indicates putting letters inside.
'ultimately' says to take the final letters.
The last letter of 'ministry' is 'y'.
'flash' going around 'y' is 'FLY ASH'.

Can you help me to learn more?

I've seen this clue in The Hindu.

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