Work begins here for scientist (10)
I believe the answer is:
heisenberg
'scientist' is the definition.
(I know this)
'work begins here' is the wordplay.
'work' indicates an anagram.
'begins'+'here'='beginshere'
'beginshere' is an anagram of 'HEISENBERG'.
'for' acts as a link.
(Other definitions for heisenberg that I've seen before include "Man of principle" , "Nobel prize-winner" , "to give name in uncertainty" , "'Uncertainty principle' mathematical physicist, d. 1976 -- begins here (anag)" , "Exact location and speed ever unknown, I suggested" .)