Revealed card is better (6)
I believe the answer is:
outwit
'is better' is the definition.
(I've seen this before)
'revealed card' is the wordplay.
'revealed' becomes 'out' (I've seen this in other clues).
'card' becomes 'wit' (synonyms).
'out'+'wit'='OUTWIT'
(Other definitions for outwit that I've seen before include "Intellectually get the better of" , "Deceive through greater ingenuity" , "Gull" , "Outfox" , "Get the better of by cunning" .)