Pioneer in animal conservation (4)
I believe the answer is:
noah
'pioneer in animal conservation' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for noah that I've seen before include "Ark wright" , "Patriarch who saved his family and all the animals from drowning" , "Sailor who ran aground on Mount Ararat" , "Webster?" , "The first Arkwright!" .)