Pioneering surgeon one catalogues, might you say? (6)
I believe the answer is:
lister
'pioneering surgeon' is the definition.
(Joseph Lister pioneered antiseptic surgery)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for lister that I've seen before include "Man introducing antiseptics" , "Plough" , "One with leanings" , "Pioneer of antiseptic surgery" , "surgeon?" .)