Tell about calf meat (6)
I believe the answer is:
reveal
'tell' is the definition.
(I know that reveal is a type of tell)
'about calf meat' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'calf meat' becomes 'veal' (I've seen this in another clue).
're'+'veal'='REVEAL'
(Other definitions for reveal that I've seen before include "Make known, expose" , "Show, uncover" , "Make known to others" , "'Disclose, divulge (6)'" , "Make public" .)