Measure securing uranium sale (7)
I believe the answer is:
auction
'sale' is the definition.
(public sale)
'measure securing uranium' is the wordplay.
I cannot really see how this works, but
'measure' could be 'au' (AU is an example) and 'au' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for auction that I've seen before include "Offer to bidders" , "Occasion of lots under the gavel" , "Competitive sale" , "event with lots involved" , "Public sale to the highest bidder" .)