Ghost in English Folklore That Inhabits Mines

This page is the CodyCross answer for the clue below from Extraordinary Creatures, Group 1599, Puzzle 5 (Flightless Cormorant).

Question is: Ghost in English Folklore That Inhabits Mines

and the answer is: BLUECAP

Word Meaning:

BLUECAP — A bird, the blue titmouse.

Definitions from Wiktionary.