Flounce (5)
I believe the answer is:
frill
'flounce' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for frill that I've seen before include "Maybe superfluous piece of adornment" , "Unnecessary embellishment" , "Extra embellishment" , "Gathered strip as a trimming" , "Shared feature of Mr Punch, Richard III" .)