Order from Richard, reportedly rubbish (6)
I believe the answer is:
diktat
'order' is the definition.
(I've seen this before)
'richard reportedly rubbish' is the wordplay.
'richard' becomes 'dick' (Dick can be a nickname for Richard).
'reportedly' shows a homophone (sound like).
'rubbish' becomes 'tat' (tat can mean rubbish or poor-quality material).
'dick' is a homophone of 'dik'.
'dik'+'tat'='DIKTAT'
'from' acts as a link.
(Other definitions for diktat that I've seen before include "Order allowing no opposition" , "A firm statement or decree" , "Autocratic decree" , "Decree imposed from above" , "Forceful order that must be obeyed" .)