I think the answer to 3D is FILLIES (horses).
This comes from almost a spur - FILLI (P) and the directions (E)ast and (S)outh. According to Chambers a fillip is a stimulus or a boost (i.e. spur).
1'm not sure about VERD(ANT & VERD(URE) There is a river Ure but there is also a river Ant (on the Norfolk Broads). The answer to 5D would make it clear but I haven't as yet solved the clue. 5D Model fighting to make game show (5,4). I have ?O??? / W???