Good news on Wall Street (5)
I believe the answer is:
rally
'good news on wall street' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rally that I've seen before include "Recover; sequence of shots" , "Bring together for a purpose, troops perhaps" , "Revive - assembly" , "Mass meeting -- revive" , "Large gathering" .)