Marbles provided by Nigel, perhaps (5)
I believe the answer is:
elgin
'marbles' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?
'nigel perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'nigel' with letters rearranged gives 'ELGIN'.
'provided by' acts as a link.
Can you help me to learn more?
(Other definitions for elgin that I've seen before include "Sculpture collector" , "Earl who acquired Parthenon marbles" , "Scottish town on the River Lossie" , "Marble-gathering earl" , "Ingle (anag.)" .)