Demand gold, returning flushed (5)
I believe the answer is:
order
'demand' is the definition.
(I've seen this before)
'gold returning flushed' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'returning' says the letters should be written backwards.
'flushed' becomes 'red' (synonyms).
'red' written backwards gives 'der'.
'or'+'der'='ORDER'
(Other definitions for order that I've seen before include "Select from menu" , "Instruction - arrangement" , "kind > direction" , "Right arrangement" , "Society of monks/nuns" .)