Mrs __ Is Revealed as the Mother of Lyra Belacqua
Puzzle 7 of Spicy Things Easy Pack
Question is: Mrs __ Is Revealed as the Mother of Lyra Belacqua
and the answer is: COULTER
Word Meaning:
COULTER — A cutter, consisting of a blade in either knife form or disk form, attached to the ploughbeam of a plough to cut the sward, in front of the ploughshare and mouldboard.
Definitions from Wiktionary.