Sort of marbles Nigel played with (5)
I believe the answer is:
elgin
'sort of marbles' is the definition.
The definition suggests a singular noun which matches the answer.
'nigel played with' is the wordplay.
'played with' indicates an anagram (I've seen this in other clues).
'nigel' with letters rearranged gives 'ELGIN'.
Can you help me to learn more?
(Other definitions for elgin that I've seen before include "town in Scotland" , "Scottish place" , "Scottish earl who took statues from the Parthenon" , "Moray town, Earldom" , "one who removed antiquities" .)