Crossword Puzzle Exist.

Clue: Exist.

Existed at one time (WERE with 4 letters)
Existential musing (WHYAMIHERE with 10 letters)
Guess as to how the thong came to exist? (GSTRINGTHEORY with 13 letters)
"Existence" (VIE with 3 letters)
Add-on with exist (ENCE with 4 letters)
Wretched existence (DOGSLIFE with 8 letters)
With "leave," settle for the existing situation (WELLENOUGHALONE with 15 letters)
Existence in Latin (ESSE with 4 letters)
No longer existing: Abbr. (EXT with 3 letters)
Exist as a group (ARE with 3 letters)