Workers depressed easily (5,4)
I believe the answer is:
hands down
'easily' is the definition.
('hands down' can be a synonym of 'easily')
'workers depressed' is the wordplay.
'workers' becomes 'hands' (hand is a kind of worker).
'depressed' becomes 'down' ('down' can be a synonym of 'depressed').
'hands'+'down'='HANDS DOWN'
(Other definitions for hands down that I've seen before include "Common teaching command" , "six-thirty?" , "without effort" , "Workers not functioning" , "extremely easily" .)