Crossword puzzle clue "a standard shown on a royal observatory wall"

Here are the possible solutions for a standard shown on a royal observatory wall clue

Answer
Clue
Relevancy
yard
Clue
A standard shown on a Royal Observatory wall
masterclock
Clue
Naval Observatory standard setter
greenwich
Clue
London borough, site of the Royal Observatory
wren
Clue
Architect of the Royal Observatory in Greenwich
cinemas
Clue
"The Wall" was shown in them
Definition
CINEMA, a motion-picture theatre, also KINEMA
poors
Clue
Wall Street's Standard & __
arecibo
Clue
Puerto Rico's -- Observatory
___ Observatory, home of the world's largest single-aperture radio telescope

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