Very good bed's embroidered decoration (5)
I believe the answer is:
picot
'embroidered decoration' is the definition.
(type of design in embroidery)
'very good bed's' is the wordplay.
'very good' becomes 'pi' (I've seen this in other clues).
'bed' becomes 'cot' (cot is a kind of bed).
'pi'+'cot'='PICOT'
(Other definitions for picot that I've seen before include "Embroidery stitch - topic (anag)" , "loopy pattern" , "Pattern of small loops, as in lace" , "Small lace edging loop" , "Topic about ornamental thread loop" .)