Bad trade died when rushed (6)
I believe the answer is:
darted
'rushed' is the definition.
(darting is a kind of rushing)
'bad trade died' is the wordplay.
'bad' indicates an anagram.
'died' becomes 'd'.
'trade' with letters rearranged gives 'darte'.
'darte'+'d'='DARTED'
'when' is the link.
(Other definitions for darted that I've seen before include "Moved suddenly like game missile" , "Dashed, flitted" , "Moved rapidly and lightly" , "Moved quickly and suddenly" , "Dashed, on the electric train?" .)