Go after opponents at table, then prosecute (5)
I believe the answer is:
ensue
'go after' is the definition.
(I've seen this in another clue)
'opponents at table then prosecute' is the wordplay.
'opponents at table' becomes 'EN' (East and North are opponents in a game of bridge).
'then' says to put letters next to each other.
'prosecute' becomes 'sue' (I've seen this in another clue).
'en'+'sue'='ENSUE'
(Other definitions for ensue that I've seen before include "Follow as a consequence" , "Befall" , "Come to pass" , "Happen - to come later" , "Proceed" .)