What does the cryptic crossword clue "Good deed: at first saving lives at sea, then slid on ice (7)" mean?

The definition is "slid on ice". The wordplay uses an anagram. anagram of G DEED SL = SLEDGED; definition: "slid on ice" The answer is SLEDGED.

Good deed: at first saving lives at sea, then slid on ice (7)

Guardian Cryptic #29321 | 27 Across | 2024-03-04 flower