What does the cryptic crossword clue "Some err terribly showing deep guilt (7)" mean?

The definition is "guilt". The wordplay uses an anagram. anagram of SOME + ERR = REMORSE; definition: "guilt" The answer is REMORSE.

Some err terribly showing deep guilt (7)

Daily Mail Cryptic #17086 | 10 Across | 2023-04-28 flower