White Rose ___-Tea (first instant iced tea, pronouced 'ready')
14A
Ante merīdiem, briefly
15A
Social Network, briefly
16A
"That's ____!" the director called, finishing up filming The Real Slim Shady's music video (1, 3)
17A
After Do but before Mi and Fa
18A
Mother
19A
Information Sharing and Analysis Organization, briefly
20A
Trimmed the perimeter of the lawn
21A
Argon symbol
22A
Government Employees' Retirement System, briefly
23A
Unregistered trademark symbol
24A
A condition where a person has two differently colored eyes.
25A
Words emblazoned on the front of the Hitchhiker's Guide to the Galaxy, or another way to say "Stay calm!" (4, 5)
27A
Fetched
28A
Auditor of official regulations
29A
Italian fashion designer with eponymous brand; or Italian former professional motorcycle road racer Rossi (anagram of ANTINOVEL)
30A
Biodiversity setting
Verticales
1D
Without laughing or smiling (8-5)
2D
Supervise
3D
A movement that often produced satirical and nonsensical works, including cut-up writing and sculpture, the first word being a baby's first word, maybe (4, 3)
4D
Used for the storage of fat, as body tissue (anagram of DOSEPIA)
5D
Stock unit, of a corporation or financial asset
6D
Used a stopwatch
7D
Burn with steam
8D
Rice with chicken tikka masala
12D
High price to pay, metaphorically (2, 3, 3, 1, 3)
25D
Car trip
26D
1984 computer storage media successor to the 3.5" floppy disk that could store over 400x the data (2-3)