Ill omen with crew's latest arrival (8)
I believe the answer is:
newcomer
'latest arrival' is the definition.
'newcomer' can be an answer for 'arrival' (I have seen 'Fresh arrival' mean 'newcomer' so perhaps 'arrival' could also mean 'newcomer'). I am not sure about the 'latest' bit.
'ill omen with crew's' is the wordplay.
'ill' indicates an anagram.
'with' means one lot of letters go next to another.
'omen' after 'crew' is 'crewomen'.
'crewomen' anagrammed gives 'NEWCOMER'.
Can you help me to learn more?
(Other definitions for newcomer that I've seen before include "Immigrant" , "Parvenu" , "Late arrival" , "Starter" , "He has just arrived or started" .)