Young woman's clothed fashionably in red garment (9)
I believe the answer is:
minidress
'garment' is the definition.
(I've seen this before)
'young woman's clothed fashionably in red' is the wordplay.
I cannot really see how this works, but
'woman's' could be 'dres' and 'dres' is present in the answer.
'in' is found in the answer.
The remaining letters 'mis' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for minidress that I've seen before include "Very short garment" , "Very short clothing item" .)