Agitation that's hidden under a skirt? (6)
I believe the answer is:
bustle
'agitation' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for bustle that I've seen before include "Busy oneself noisily about the former feature of women's dress" , "Subtle kind of commotion" , "Scurry - frame worn under skirt" , "Frame under a dress" , "Subtle kind of hubbub" .)