Through the end of the year, Starwood Preferred Guest is offering free Gold status to members of CLEAR (expedited security, but distinguished from PreCheck).
The offer also includes 1000 bonus points per stay, up to 10 stays, through December 31.
The signup form asks for your CLEAR membership number, I do not know whether they ever validate that membership number.
But signing up for CLEAR is enough to get Starwood Gold status. And there have been plenty of free trial offers for CLEAR, for instance if you’ve signed up for Milepoint Premium one of the benefits is a 90 day free trial with CLEAR.