Was successful in getting one mentioned (3)
I believe the answer is:
won
'was successful' is the definition.
(I've seen this in another clue)
'one mentioned' is the wordplay.
'mentioned' indicates a 'sounds like' (homophone) clue.
'one' sounds like 'WON'.
'in getting' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for won that I've seen before include "Eastern currency" , "Korean currency, was victorious" , "Succeeded, conquered" , "Came first" , "prevailed" .)