Delight taking in a show (6)
I believe the answer is:
reveal
'show' is the definition.
(I know that reveal is a kind of show)
'delight taking in a' is the wordplay.
'delight' becomes 'revel' (I've seen this before).
'taking in' indicates putting letters inside.
'revel' enclosing 'a' is 'REVEAL'.
(Other definitions for reveal that I've seen before include "Divulge; make visible" , "Make known to others" , "Expose, divulge" , "Final disclosure" , "Show, uncover" .)