Sell uranium which military operation has seized (7)
I believe the answer is:
auction
'sell' is the definition.
(auctioning is a kind of selling)
'uranium which military operation has seized' is the wordplay.
I cannot really see how this works, but
'uranium' could be 'u' (U is the chemical symbol for uranium) and 'u' is located in the answer.
'operation' could be 'action' and 'action' is found within the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for auction that I've seen before include "A lot will be seen in this" , "Lots are sold here!" , "Public sale - type of bridge" , "Public sale to the highest bidder" , "Public sale with lots" .)