... court witness (3)
I believe the answer is:
see
This clue is a double definition.
'court' is the first definition.
(both can mean to date somebody)
'witness' is the second definition.
(I know that witness can be written as see)
(Other definitions for see that I've seen before include "Observe - diocese" , "View; realise" , "Spot" , "Set eyes on" , "Bishop's seat" .)