Minimal asset of shipping company that's something of a joke (8)

I believe the answer is:

oneliner

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'minimal asset of shipping company that's something' is the definition.
I know nothing about this answer so I can't tell whether this works.

'a joke' is the wordplay.
'a' becomes 'one'.
'joke' becomes 'liner' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'one'+'liner'='ONELINER'

'of' is the link.

Can you help me to learn more?

(Another definition for oneliner that I've seen is " Witty remark".)

I've seen this clue in The Irish Times.

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