Marbles man — Nigel, possibly (5)
I believe the answer is:
elgin
'marbles man' is the definition.
(I've seen this before)
'aeur nigel possibly' is the wordplay.
'nigel' anagrams to 'ELGIN'.
But, I am unsure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for elgin that I've seen before include "Scots town; - marbles" , "Scottish earl who took statues from the Parthenon" , "Marble-gathering earl" , "He removed marble sculptures from the Parthenon" , "one who removed antiquities" .)