What does the cryptic crossword clue "Doc at ground for group of eight (5)" mean?

The definition is "group of eight". The wordplay uses an anagram. anagram of DOC + AT = OCTAD; definition: "group of eight" The answer is OCTAD.

Doc at ground for group of eight (5)

Daily Mail Cryptic #17324 | 20 Across | 2024-03-28 flower