Every 3,600 seconds
Hourly
Under "A":
"A rooflike shelter of canvas"
Awning
The moment an airplane lands on the ground
Touchdown
"Harold & Kumar Go to White ____"
Castle
A light bulb will sometimes light up over an animated character's head when he gets one of these
Idea
Time for the worm-catching bird
Early
Under "J":
"The completion of 50 years of existence... or its celebration"
Jubilee
The profit you get back on an investment
Return
"Elvis Has Left the ____"
Building
Shrubby succulent used to treat burns
Aloe
It's the "F" before "AQ"
Frequently
Under "O":
"Out of use for at least the past century"
Obsolete
Hook, line, sinker... all that fishing gear
Tackle
2003's "The Haunted ____"
Mansion
Meaning "place" or "stead", this French word is routinely seen between "in" & "of"
Lieu
The Greek speirein, to scatter or sow, is related to this synonym for "irregularly" that also starts with "sp"
Sporadically
Under "I":
In Greek literature, "pertaining to satirical poetry written in" a certain meter
Iambic
A sharp momentary surge in electrical current
Spike
2012's "____ in the Woods"
Cabin
5-letter term for a mathematical proposition assumed without proof
Axiom
It can mean "soon" or "in a rude or curt manner"
Shortly
Under "G":
"Throaty... characterized by a sound articulated in the back of the mouth"
Guttural
Folded puff pastry
Turnover
1999's "Brokedown ____"
Palace
Someone learning a new job--on a locomotive, it sounds like
Trainee