Nineties produced a great physicist (8)
I believe the answer is:
einstein
'a great physicist' is the definition.
'einstein' can be an answer for 'physicist' (Einstein is an example). I'm not certain of the 'a great' bit.
'nineties produced' is the wordplay.
'produced' indicates an anagram.
'nineties' with letters rearranged gives 'EINSTEIN'.
Can you help me to learn more?
(Other definitions for einstein that I've seen before include "Mastermind" , "Famous physicist, mathematician" , "Disney's 14 [GREAT DANE]" , "He contributed the theory of relativity" , "German physicist in the mad nineties" .)