Crossword puzzle clue "crucial part"

Here are the possible solutions for crucial part clue

Answer
Clue
Relevancy
essence
Clue
Crucial part
Definition
a fundamental nature
exhaustsystem
Clue
Crucial car part
hihat
Clue
Drum kit part crucial for that disco beat
keymantle
Clue
Crucial part of the Earth's layers?
acidtest
Clue
Crucial trial
Crucial experiment
Crucial, final proof of quality.
acidtests
Clue
Crucial trials

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