1d Chaser - 'C(atholic)' + anag 'hears'
4d Defiance - anag 'feed Cain'
15d Wheat - 'what(?)' (about) 'E(uropean)'
10a Shunt - 's(econd)' + 'hunt'
14a Brand new - 'brand' (trademark) + 'new' (novel)
16a Common sense - 'common' (green) + 'sense' (feel)