Take great delight over one in show (6)
I believe the answer is:
reveal
'show' is the definition.
('reveal' can be a synonym of 'show')
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for reveal that I've seen before include "Expose or disclose" , "Remove cover, unveil" , "Show, uncover" , "Disclose or uncover" , "Uncover or expose" .)