Something done about uranium sale (7)
I believe the answer is:
auction
'sale' is the definition.
(I've seen this before)
'something done about uranium' is the wordplay.
'something done' becomes 'action' (I've seen this before).
'about' indicates putting letters inside.
'uranium' becomes 'u' (U is the chemical symbol for uranium).
'action' going around 'u' is 'AUCTION'.
(Other definitions for auction that I've seen before include "Public sale to highest bidders" , "Public sale by bid" , "Public bidding sale" , "Public sale with lots" , "Where things are sold to the highest bidder" .)