Egg on uniform -- regret scrubbing every other part (4)
I believe the answer is:
urge
'egg on' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for urge that I've seen before include "Itch" , "Implore" , "Constrain" , "Strong impulse, desire" , "Egg on, encourage to proceed" .)