Disclose regarding meat (6)
I believe the answer is:
reveal
'disclose' is the definition.
(I know that disclose can be written as reveal)
'regarding meat' is the wordplay.
'regarding' becomes 're' (re can mean regarding, concerning).
'meat' becomes 'veal' (veal is a kind of meat).
're'+'veal'='REVEAL'
(Other definitions for reveal that I've seen before include "Remove cover to display" , "Tell the truth" , "Uncover or expose" , "Spill beans" , "Disclose, make apparent" .)