23)Spruce marked out by machine (4,8)
27)Bull knocks end off luxury car (8)...........have a hunch this might be name of luxury car ending in "ble" but can't think of anything other than convertible! and that doesn't leave anything connected with farm.
46)Point to the Italian years for pickled grass(6)
53)Smelly guy on river (6)
57)Gathers forever, a moving grass collector (6,9)