Hang out clothes about one, iron dress and dressing gown (8)

I believe the answer is:

peignoir

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'dressing gown' is the definition.
(peignoir is a kind of dressing gown)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for peignoir that I've seen before include "Woman's light dressing gown" , "habit" , "Woman's loose full dressing gown" , "bathrobe" , "Woman's light dressing-gown" .)

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

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