Uncovered meat in rush (8)
I believe the answer is:
revealed
'uncovered' is the definition.
('reveal' can be a synonym of 'uncover')
'meat in rush' is the wordplay.
'meat' becomes 'veal' (veal is a kind of meat**).
'in' means one lot of letters goes inside another.
'rush' becomes 'reed' (I've seen this before).
'veal' inserted within 'reed' is 'REVEALED'.
(Other definitions for revealed that I've seen before include "Shown" , "Discovered" , "'Made known, disclosed (8)'" , "Exposed" , "Made known to others" .)