Crossword puzzle clue "important prefix"

One with an important role in the production of a fantasy film or period drama (not so important for a porno, though)

Important prefix

Prefix whose last two letters are a prefix meaning the same thing

Event where the number 12 is important, and a feature of 12 two-word answers in this puzzle

Important vitamins.

Most important

Place for an important newspaper story

Too important to deal with lowly cleaning?