See Ray tyre changing? That day is gone (10)
I believe the answer is:
yesteryear
'see ray tyre changing? that day is gone' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'see ray tyre changing?' is the wordplay.
'changing?' indicates an anagram.
'see'+'ray'+'tyre'='seeraytyre'
'seeraytyre' with letters rearranged gives 'YESTERYEAR'.
Can you help me to learn more?
(Other definitions for yesteryear that I've seen before include "nostalgic time, perhaps" , "Nostalgic days" , "Time disappeared" , "Days of old (poet.)" , "Former times" .)