Obvious list of cargo (8)
I believe the answer is:
manifest
This clue might be a double definition.
'obvious' is the first definition.
(similar in meaning)
'list of cargo' is the second definition.
'manifest' can be an answer for 'list' (I have seen 'list of passengers' mean 'manifest' so perhaps 'list' could also mean 'manifest'). I am not certain of the 'of cargo' bit.
Can you help me to learn more?
(Other definitions for manifest that I've seen before include "Customs document listing contents of ship or plane" , "list of passengers flying" , "Easily noticed - cargo list" , "show" , "Obvious, like ship's cargo list" .)