Clean up in lottery (5)
I believe the answer is:
sweep
I believe this is a double definition.
'clean up' is the first definition.
(I've seen this before)
'lottery' is the second definition.
(I've seen this before)
'in' acts as a link.
(Other definitions for sweep that I've seen before include "Wide scope" , "Dust" , "Long oar" , "Use a brush" , "Victorian child labourer" .)