I think you may be referring to Lupus (The Wolf).
Another one is NORMA
Answer should be norma because 5a is National trust and clues share first letter.
Norma
Scorpius comes between the constellations of Sagittarius and Libra. It's also near Ara, Lupus and Norma.
In ancient times, the constellation was considered a small group of stars withinCentaurus, and was thought to have been an animal killed, on behalf of Centaurus. It was not separated from Centaurus until Hipparchus named it Therion (meaning beast) in the 200s BC. No particular animal was associated with it until the Latin translation of Ptolemy's work identified it with the wolf. See link for more information
This is NORMA
The constellation between Hercules and Cygnus is known as Lyra. Lyra is a small constellation that is home to the bright star Vega and is often depicted as a harp in ancient mythology.
we are in the milky way Galaxy! the Centaurus arm is just a small part of the milky way.
It is not known as a constellation
Alpha Centauri (the brightest star in the constellation Centaurus) is the closest star to earth, and is actually a double star system - when it's small companion star is on "our side" of Alpha C, it is actually closest. The system is about 4.3 light years away. Sirius is the brightest star in the night sky, a white giant, and is about 9 light years away.
Not to be confused with the aurora borealis, the Corona Borealis is a small constellation in the northern hemisphere between Bootes and Hercules.
The nickname of the constellation Delphinus is The Dolphin
Leo is the 12th largest constellation in the night sky.
A small group of stars that appear to be close together are often known a cluster. Technically its an asterism.
dorado