Spot excited punter over the moon (8)
I believe the answer is:
eruption
'spot' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?
'excited punter over the moon' is the wordplay.
'excited' indicates anagramming the letters.
'over' indicates putting letters inside.
'the moon' becomes 'Io' (moon of Jupiter).
'punter' with letters rearranged gives 'eruptn'.
'eruptn' going around 'io' is 'ERUPTION'.
Can you help me to learn more?
(Other definitions for eruption that I've seen before include "Kind of explosion, volcano or heavy sneeze" , "Rash - outburst" , "Volcanic explosion" , "Breaking out (of spots, lava etc)" , "Violent discharge of volcanic material" .)