Show on the subject of meat (6)
I believe the answer is:
reveal
'show' is the definition.
(I know that reveal is a more specific form of the action show)
'the subject of meat' is the wordplay.
'the subject of' becomes 're' ('re' means regarding or about).
'meat' becomes 'veal' (veal is a kind of meat).
're'+'veal'='REVEAL'
'on' is the link.
(Other definitions for reveal that I've seen before include "Final disclosure" , "window, in part" , "Make known, uncover and allow to be seen" , "Open up" , "Remove cover, unveil" .)