Nelson led a man astray (7)
I believe the answer is:
mandela
'nelson' is the definition.
(I've seen this before)
'led a man astray' is the wordplay.
'astray' indicates anagramming the letters.
'led'+'a'+'man'='ledaman'
'ledaman' with letters rearranged gives 'MANDELA'.
(Other definitions for mandela that I've seen before include "Nelson . . . . . . ., great African statesman (7)" , "South African political hero" , "Nelson --, South African politician" , "Could be Nelson" , "Nelson --, South African statesman" .)