Disclose, about meat (6)
I believe the answer is:
reveal
'disclose' is the definition.
(I know that disclose can be written as reveal)
'about meat' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'meat' becomes 'veal' (veal is a kind of meat).
're'+'veal'='REVEAL'
(Other definitions for reveal that I've seen before include "Make known to others" , "Make disclosure" , "Make known, expose" , "Disclose, make apparent" , "'Make known, disclose (6)'" .)