Crossword puzzle clue "keystone group"

Here are the possible solutions for keystone group clue

Answer
Clue
Relevancy
kops
Clue
Keystone group
'Keystone' group of silents
Definition
KOP, (South African) a hill
allentownpa
Clue
Sound system in the Keystone State?
altoona
Clue
Keystone State city
anthracite
Clue
Product of the Keystone State.
Definition
a kind of hard coal
arch
Clue
Keystone support
Place for a keystone
Keystone's place
Definition
sly, mischievous

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