Put one over on (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
snow
'put one over on' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for snow that I've seen before include "Wintry flakes?" , "Vessel" , "Downfall of white" , "Standard of whiteness" , "White specks on screen resulting from interference" .)