In casino it avoids rejecting a hand (7)
I believe the answer is:
ovation
'a hand' is the definition.
(thesaurus)
'in casino it avoids rejecting' is the wordplay.
'in' indicates the answer is hidden within the clue.
'rejecting' is a reversal indicator (I've seen 'rejected' mean this).
'noitavo' can be found hidden inside 'casino it avoids'.
'noitavo' reversed gives 'OVATION'.
(Other definitions for ovation that I've seen before include "Enthusiastic and loud applause (sometimes standing)" , "Applause, acclaim" , "Plaudits" , "Some will stand for it" , "Great outburst of applause" .)