Italian back among Somalis playing very high (9)
I believe the answer is:
altissimo
'very high' is the definition.
(musical term)
'italian back among somalis playing' is the wordplay.
'italian' becomes 'it' (abbreviation for Italian).
'back' says the letters should be written backwards.
'among' is an insertion indicator.
'playing' indicates an anagram.
'it' backwards is 'ti'.
'somalis' with letters rearranged gives 'alssimo'.
'ti' placed inside 'alssimo' is 'ALTISSIMO'.
(Other definitions for altissimo that I've seen before include "Very high musical pitch" , "Very highly pitched" , "one is almost dizzy" , "Very highly placed" .)