In no man's land, Lee shot world leader (6,7)

I believe the answer is:

nelson mandela

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

'leader' is the definition.
(I know that Nelson Mandela is a nationalist leader)

'in no man's land lee shot world' is the wordplay.
'no man's land lee' anagrams to 'NELSON MANDELA'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for nelson mandela that I've seen before include "South African president, d. 2013" , "national leader" , "statesman" .)

I've seen this clue in The Guardian.

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