*Of lesser importance (8)

I believe the answer is:

minotaur

(Other definitions for minotaur that I've seen before include "Mythical creature" , "Creature, half-man and half-bull, slain by Theseus in the Cretan maze" , "Monster, half bull and half man, slain by Theseus in Cretan labyrinth" , "Bull-headed Cretan monster" , "Mythological man-bull" .)

I've seen this clue in The Wall Street Journal.

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