Beginning of spectacular meteor shower over southern county (8)
I believe the answer is:
somerset
'county' is the definition.
(I've seen this before)
'beginning of spectacular meteor shower over southern' is the wordplay.
'beginning of' indicates taking the first letters.
'shower' indicates an anagram.
'over' indicates putting letters inside.
'southern' becomes 's' (abbreviation).
The initial letter of 'spectacular' is 's'.
'meteor' with letters rearranged gives 'omeret'.
'omeret' enclosing 's' is 'omerset'.
's'+'omerset'='SOMERSET'
(Other definitions for somerset that I've seen before include "Cheddar Gorge's county" , "Maugham" , "SW county" , "Wells's county" , "English county known for its cider and Cheddar cheese" .)