Boffin succeeded in tricks to entice criminal (6,9)
I believe the answer is:
rocket scientist
'boffin' is the definition.
(I've seen this before)
'succeeded in tricks to entice criminal' is the wordplay.
'succeeded' becomes 's' (genealogical abbreviation).
'in' means one lot of letters goes inside another.
'criminal' indicates anagramming the letters.
'tricks'+'to'+'entice'='trickstoentice'
'trickstoentice' is an anagram of 'rocketscientit'.
's' inserted within 'rocketscientit' is 'ROCKET SCIENTIST'.
(Other definitions for rocket scientist that I've seen before include "I launch farreaching studies" , "brain" , "Mastermind" , "boffin" , "A high achiever" .)