Good deed: at first saving lives at sea, then slid on ice (7)
I believe the answer is:
sledged
'slid on ice' is the definition.
The answer and definition can be both to do with motion as well as being past participle verbs.
Maybe they are linked in a way I don't understand?
'good deed at first saving lives at sea' is the wordplay.
'good' becomes 'g' (abbreviation).
'at first' suggests taking the first letters.
'at sea' is an anagram indicator.
The first letters of 'saving lives' is 'sl'.
'g'+'deed'+'sl'='gdeedsl'
'gdeedsl' is an anagram of 'SLEDGED'.
'then' acts as a link.
Can you help me to learn more?
(Another definition for sledged that I've seen is " Tobogganed".)