Cat eating a rat's head and throat part (6)
I believe the answer is:
larynx
'throat part' is the definition.
'cat eating a rat's head' is the wordplay.
'cat' becomes 'lynx' (lynx is a kind of cat).
'eating' indicates putting letters inside.
'head' says to take the initial letters.
The initial letter of 'rats' is 'r'.
'a'+'r'='ar'
'lynx' enclosing 'ar' is 'LARYNX'.
'and' is the link.
(Other definitions for larynx that I've seen before include "Creator of speech" , "part of pipe" , "Source of squeaks" , "Where growls come from" , "The formal voice box" .)