Bridge player, say, engaged in some work, producing unexpected feature (6,3)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

EAST (bridge player) EG (say) insert ERG (some work). I don’t quite see the unexpected aspect, I was expecting one and it arrived! EDIT I have now found it is in Collins, “Easter egg – a bonus or extra feature hidden inside a website, computer game, or DVD, that is only revealed after repeated or lengthy viewing or playing.”. As I don’t do video games or watch DVDs I was unaware of it. Obviously, the setter was more au fait.