1933 physics Nobelist Paul (5)
I believe the answer is:
dirac
'1933 physics nobelist paul' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dirac that I've seen before include "constant originator" , "Paul -, physicist; I'd arc (anag.)" , "Nobel Prize winner" , "English physicist" , "Scientist" .)