Among the decorations a showy piece of regalia (4)
I believe the answer is:
sash
'regalia' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?
'among the decorations a showy piece' is the wordplay.
'piece' indicates a hidden word.
'SASH' is hidden in the letters of 'among decorations a showy'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for sash that I've seen before include "type of cord?" , "Ribbon as a symbol of rank" , "Strip of cloth - type of window" , "Band of cloth" , "Ribbon worn over the shoulder" .)