Artificial pitch of latest ground (8)
I believe the answer is:
'artificial pitch' is the definition.
(I've seen this before)
'of latest ground' is the wordplay.
'ground' indicates anagramming the letters ('grind' the letters into a new form).
'oflatest' with letters rearranged gives 'FALSETTO'.
(Other definitions for falsetto that I've seen before include "high notes?" , "Voice that's raised" , "Unnatural voice" , "High vocal range" , "Singing voice forced above its natural one" .)