Departures from no malaise at sea (9)
I believe the answer is:
anomalies
'departures' is the definition.
Although both the answer and definition are plural nouns, I don't understand how one could define the other.
'no malaise at sea' is the wordplay.
'at sea' indicates an anagram.
'no'+'malaise'='nomalaise'
'nomalaise' is an anagram of 'ANOMALIES'.
'from' is the link.
Can you help me to learn more?
(Other definitions for anomalies that I've seen before include "Deviations from the normal or common" , "Things deviating from norm" , "They're unusual or different from what is expected" , "exceptions" , "odd events" .)