As ridden by an escort circling the ring? (7)
I believe the answer is:
scooter
'as ridden by an' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'escort circling the ring?' is the wordplay.
I cannot quite see how this works, but
'ring?' could be 'o' and 'o' is found within the answer.
an anagram of 'escort' is 'scoter' which is located in the left over letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for scooter that I've seen before include "Child's two-wheeled vehicle" , "Small motorcycle" , "it may need physical boost" , "Moveable toy" , "motor transport" .)