Bridge player, say, engaged in some work, producing unexpected feature (6,3)
I believe the answer is:
easter egg
'unexpected feature' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'bridge player say engaged in some work' is the wordplay.
'bridge player' becomes 'east' (name given to one player in the card game bridge).
'say' becomes 'eg' (both can mean for example).
'engaged in' is an insertion indicator.
'some work' becomes 'erg' (scientific unit of work).
'eg' placed into 'erg' is 'eregg'.
'east'+'eregg'='EASTER-EGG'
'producing' is the link.
Can you help me to learn more?
(Other definitions for easter egg that I've seen before include "Sweet for Spring festival" , "festive gift" , "Seasonal confection" , "Candy to celebrate Spring festival" , "Edible seasonal symbol" .)