Place for better business person is a crafty cover-up (6)
I believe the answer is:
casino
'place for better' is the definition.
(I've seen this before)
'business person is a crafty cover-up' is the wordplay.
'cover' indicates the answer is hidden within the clue (I've seen 'covering' mean this).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'onisac' is hidden in the letters of 'business person is a crafty'.
'onisac' backwards is 'CASINO'.
(Other definitions for casino that I've seen before include "enterprise?" , "Place for better" , "Gaming house" , "Where gambling may be seen" , "Gaming place" .)