Crossword Genius

It’s said in scorn of a large port (3,4)

Ross

I believe the answer is:

big deal

I'm a little stuck... Click here to teach me more about this clue!

'it's said in scorn' is the definition.
I can't judge whether this defines the answer.

'a large port' is the wordplay.
'a large' becomes 'big' (I've seen this before).
'port' becomes 'deal' (I can't justify this - if you can you should give a lot more credence to this answer).
'big'+'deal'='BIG DEAL'

'of' is the link.

Can you help me to learn more?

(Other definitions for big deal that I've seen before include "Successful piece of business (ironical)" , "Potential slam hand at bridge" , "doesn't impress me at all" , "disparaging reply" , "Important transaction - so what!" .)

I've seen this clue in the Evening Standard.
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