Tendency to stuff goods roughly into long ship (11)

I believe the answer is:

piggishness

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'tendency' is the definition.
The definition and answer can be both human attributes as well as being singular nouns.
Maybe there's an association between them I don't understand?

'stuff goods roughly into long ship' is the wordplay.
I cannot really understand how this works, but
'stuff' could be 'hn' (HN is an example) and 'hn' is present in the answer.
'goods' could be 'gg' (an abbreviation for 'good' repeated) and 'gg' is found in the answer.
'ship' could be 'ss' (prefix in ship names eg SS Great Britain) and 'ss' is present in the answer.
This explanation may well be incorrect...

'to' acts as a link.

Can you help me to learn more?

I've seen this clue in The Times.

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