Related Clues:

• Like the elements He, Ne and Xe
• Disinclined to form compounds
• In the end, right before tea, the last three of 15 down begin to feel lethargic
• Still reaching for the stars during theatre night
• Passive, static
• Still pirouetting in Montmartre nightspot
• Still time to move east in Bury
• Part of container train still
• Still partial to finer things
• Reverse, losing velocity still
• With 79-Across, entry in the periodic table's last column
• Still at the crease: no boundaries in Perth
• Where American casualties may be tense still
• Passive joiner tweaking cases
• Still turn up, very lost