What does the cryptic crossword clue "Peer in trio's car at ground (10)" mean?

The definition is "Peer". The wordplay uses an anagram. anagram of TRIO'S + CAR + AT = ARISTOCRAT; definition: "Peer" The answer is ARISTOCRAT.

Peer in trio's car at ground (10)

Daily Mail Cryptic #17142 | 11 Across | 2023-07-17 flower