Funny rhyme about Shannon port (8)

I believe the answer is:

limerick

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This could be a double definition.

'funny rhyme' is the first definition.
'limerick' can be an answer for 'rhyme' (I've seen this before). I am not sure about the 'funny' bit.

'shannon port' is the second definition.
'limerick' can be an answer for 'port' (I've seen this before). I am not certain of the 'shannon' bit.

'about' acts as a link.

Can you help me to learn more?

(Other definitions for limerick that I've seen before include "port used in Ireland" , "Type of humorous verse" , "Rhyme" , "Verse form - Irish city" , "Five-lined poem" .)

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

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