Crossword Genius

No prohibition for port (4)

Ross

I believe the answer is:

oban

'for port' is the definition.
(Oban is a Scottish port)

'no prohibition' is the wordplay.
'no' becomes 'O' (resembles 0 - 'no' can mean 'zero').
'prohibition' becomes 'ban' (ban is a kind of prohibition).
'o'+'ban'='OBAN'

(Other definitions for oban that I've seen before include "Argyll and Bute resort" , "Scottish town" , "Port in W. Scotland" , "Port in western Scotland" , "Scottish west coast resort" .)

I've seen this clue in the Sydney Morning Herald.
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