Secret retreat hidden in this puzzle's nine longest answers

Question:

Answer:

DEN

Length:

Similar Crossword Questions:

A different one is hidden in each of this puzzle's seven longest answers
Right now, as hidden in this puzzle's longest answers
They're hidden in this puzzle's eight longest answers
Hoop group hidden inside this puzzle's three longest answers
Five of them are hidden in this puzzle's longest answers
HBO's "Inside the __" (and hidden theme in this puzzle's four longest answers)
Role model hidden in this puzzle's longest answers
Theme of this puzzle hidden in the seven other longest across answers
Place to live (different ones are hidden in this puzzle's four longest answers)
They're hidden in this puzzle's seven longest answers
Driveway stuff (and word that's hidden in this puzzle's four longest answers)
Annual cause of losing an hr.'s sleep hidden in this puzzle's 10 longest answers
Apt subject for today that's hidden in this puzzle's four longest answers
They're hidden in this puzzle's six longest answers
Call hidden in this puzzle's eight longest answers that's apt for May Day?
Three-letter combinations hidden in this puzzle's six other longest answers
Peak that's hidden in the four longest puzzle answers
Featured article hidden in this puzzle's nine longest answers
Resort hidden in the five longest puzzle answers
Word hidden in this puzzle's longest answers
They're hidden in this puzzle's nine longest answers
Word rearranged and hidden in this puzzle's eight longest answers
Things hidden in this puzzle's eight longest answers
Earlier flight hidden in the seven longest puzzle answers
Word hidden backwards in this puzzle's eight longest answers