Breast meat is crisp and extremely excellent (7)
I believe the answer is:
brisket
'breast meat' is the definition.
'brisket' can be an answer for 'meat' (brisket is a kind of meat). I am not certain of the 'breast' bit.
'crisp and extremely excellent' is the wordplay.
'crisp' becomes 'brisk' (I am not sure about this - if you are sure you should believe this answer much more).
'and' means one lot of letters go next to another.
'extremely' means to remove the middle letters (only the extremes of the word are used).
'excellent' with its middle taken out is 'et'.
'brisk'+'et'='BRISKET'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for brisket that I've seen before include "Cut of meat from a cow's breast" , "Bet kris the cut of beef" , "Meat cut from the breast of a cow" , "Breast of four-legged animal" , "Joint of beef cut from the breast" .)