Tries skirt cinched around trunks (6)

I believe the answer is:

torsos

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

'trunks' is the definition.
(I've seen this in another clue)

'tries skirt cinched around' is the wordplay.
I cannot really understand how this works, but
'around' could be 'orso' (synonyms) and 'orso' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for torsos that I've seen is " (Human) trunks".)

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

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