Show is about 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)
'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'
'is' acts as a link.
(Other definitions for reveal that I've seen before include "Leaver (anag.)" , "Make known, uncover and allow to be seen" , "Make known to others" , "Expose or display" , "Final disclosure" .)