One entertains those assembled on ship (7)
I believe the answer is:
hostess
'one entertains' is the definition.
I can't judge whether this definition defines the answer.
'those assembled on ship' is the wordplay.
'assembled' is an anagram indicator.
'on' means one lot of letters go next to another.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'those' anagrammed gives 'hoste'.
'hoste'+'ss'='HOSTESS'
Can you help me to learn more?
(Other definitions for hostess that I've seen before include "She looks after guests" , "Plane stewardess" , "who welcomes guests?" , "Woman giving a party" , "Woman employed by a nightclub" .)