Duke attached to court in deal, for example (4)
I believe the answer is:
wood
'deal for example' is the definition.
(deal is a kind of wood)
'duke attached to court' is the wordplay.
'duke' becomes 'd'.
'attached to' means one lot of letters go next to another.
'court' becomes 'woo' ('woo' can be a synonym of 'court').
'd' after 'woo' is 'WOOD'.
'in' is the link.
(Other definitions for wood that I've seen before include "deal?" , "Material from trees" , "Concert promoter" , "Lots of trees" , "celebrated conductor" .)