Dump worker's bonus (3)
I believe the answer is:
tip
This clue could be a double definition.
'dump worker's' is the first definition.
'tip' can be an answer for 'dump' (as in a rubbish tip). I am unsure of the 'worker's' bit.
'bonus' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for tip that I've seen before include "Gratuity or light touch" , "End; piece of advice" , "Warning" , "expected by those who wait" , "Hint about a horse" .)