A dish with sex-appeal packing on island (7)

I believe the answer is:

sashimi

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'a dish' is the definition.
(sashimi is a kind of dish)

'with sex-appeal packing on island' is the wordplay.
'with' means one lot of letters go next to another.
'sex appeal' becomes 'SA' (old-fashioned abbreviation).
'packing on' becomes 'shim' (I can't explain this - if you can you should believe this answer much more).
'island' becomes 'i' (geographical abbreviation).
'sa'+'shim' is 'sashim'.
'sashim'+'i'='SASHIMI'

Can you help me to learn more?

(Other definitions for sashimi that I've seen before include "fish food?" , "Japanese raw fish dish - his aims (anag)" , "possible accompaniment to 26 [SAKI]" , "Something of chef's" , "dish from Japan" .)

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

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