Prejudice found entering club, I assume (4)
I believe the answer is:
bias
'prejudice' is the definition.
('bias' can be a synonym of 'prejudice')
'entering club i assume' is the wordplay.
'entering' indicates the answer is hidden within the clue.
'BIAS' is hidden in the letters of 'club i assume'.
'found' is the link.
(Other definitions for bias that I've seen before include "Bigotry" , "Large city in Florida" , "Favouritism" , "A leaning or prejudice" , "(Bowls) irregular shape" .)