Chase an ignorant lad around (5,8)
I believe the answer is:
grand national
'chase' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'an ignorant lad around' is the wordplay.
'around' indicates an anagram.
'an'+'ignorant'+'lad'='anignorantlad'
'anignorantlad' is an anagram of 'GRAND NATIONAL'.
Can you help me to learn more?
(Other definitions for grand national that I've seen before include "annual competition" , "Annual steeplechase at Aintree" , "Famous steeplechase" , "Horse race" , "Annual Aintree race" .)