What does the cryptic crossword clue "Keeping watch running aground (7)" mean?

The definition is "Keeping watch". The wordplay uses an anagram. anagram of AGROUND = ONGUARD; definition: "Keeping watch" The answer is ONGUARD.

Keeping watch running aground (7)

Independent Cryptic #1811 | 18 Down | 2024-11-10 flower