Managed to get an extract of uranium (3)
I believe the answer is:
ran
'managed' is the definition.
(I've seen this before)
'an extract of uranium' is the wordplay.
'an extract of' indicates the answer is hidden within the clue (I've seen this in other clues).
'RAN' can be found hidden inside 'uranium'.
'to get' is the link.
(Other definitions for ran that I've seen before include "Was a scooter" , "Went fast" , "Took to one's heels" , "Was candidate" , "was in charge" .)