Bones in minced food upset everyone eating initially (8)
I believe the answer is:
patellae
'bones' is the definition.
(patella is a kind of bone)
'minced food upset everyone eating initially' is the wordplay.
'minced food' becomes 'pate' (paste of minced ingredients).
'upset' says the letters should be written in reverse.
'everyone' becomes 'all' (all people).
'initially' indicates taking the first letters.
The first letter of 'eating' is 'e'.
'all' backwards is 'lla'.
'pate'+'lla'+'e'='PATELLAE'
'in' is the link.
(Other definitions for patellae that I've seen before include "Bones" , "Bony bits" , "The formal kneecaps" , "Late leap twisted kneecaps" .)