Meat available, bottle it (7,3)
I believe the answer is:
chicken out
'bottle it' is the definition.
(I've seen this before)
'meat available' is the wordplay.
'meat' becomes 'chicken' (chicken is a kind of meat).
'available' becomes 'out' (I've seen this in other clues).
'chicken'+'out'='CHICKEN OUT'
(Other definitions for chicken out that I've seen before include "vegetarian's decree?" , "Be too scared to do something" , "turn yellow" , "Back down" , "Be a wimp" .)