British surgeon excising black pustule (6)

I believe the answer is:

lister

I'm a little stuck... Click here to teach me more about this clue!

'british surgeon' is the definition.
'Lister' can be an answer for 'surgeon' (Lister is an example). I am not certain of the 'british' bit.

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 "surgeon?" , "Plough" , "Man introducing antiseptics" , "Pioneer of antiseptic surgery" , "One with leanings" .)

I've seen this clue in The Hindu.

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