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So long muscular in midriff, say (3,3)

Ross

I believe the answer is:

see you

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'so long' is the definition.
(I know that so long can be written as see you)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for see you that I've seen before include "Informal kind of au revoir - with visual intent" , "Cheers" , "Bye!" , "poker-playing expression?" , "For so long" .)

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