Brilliant throw covering pitch (9)
I believe the answer is:
sparkling
'brilliant throw covering pitch' is the definition.
I can't judge whether this defines the answer.
'brilliant throw covering pitch' is the wordplay.
'brilliant throw' becomes 'sling' (I've seen this in another clue. I am not sure about the 'brilliant' bit.).
'covering' indicates putting letters inside.
'pitch' becomes 'park' (I've seen this before).
'sling' placed around 'park' is 'SPARKLING'.
Can you help me to learn more?
(Other definitions for sparkling that I've seen before include "Effervescent" , "Fizzy" , "Shining with brilliant points of light" , "like champagne" , "Not still - like diamonds" .)