1: Sixpence for big cheese? (1.1.1.)
2: Therefore, finish off this bit of work (3)
3: Brown pit, essentially, in exotic green fruit (9)
4: Foolish, turning in that penicillin (5)
5: Beer, fit for a king, is served up (5)
8: Song about river, ocean, and lake (5)
12: Arcking shot from Bill O'Brien (3)
13: Leaders of Orioles and Rangers stick in the dugout? (3)