'The Beast' is the name of the US Presidential State Car (and arguably the name of Mr. Trump too) and is also the nickname of Mark Labbett, a participant in 'The Chase' TV Quiz show. I had no idea about the latter and had to look it up.
I have all save 27d: Old instrument originally kept by organ player of yesteryear (7). I have P?IV?ER - and can make no sense of anything!! Maybe there are errors? Any ideas welcome!!!