1: Reportedly viewed some of play (5)

4: What this puzzle is (3)

6: Word of opposition from a friend of Caesar, J? (7)

7: His stable is unstable, it's found (9)

10: Gets bastion rebuilt (7)

12: One politician's a brat (3)

13: Lists scoundrels (5)

1: Notice District Governor in the cyperaceous plant? (5)

2: Demand payment? Just so! (5)

3: Prove guess in outright delight (9)

4: Revolves around a star. (3)

5: Vet theatre opening 8-down (3)

8: Hand out Kleenex, wiping away a bit of tears (5)

9: Hell, he's got the upper hand in tennis (5)

10: Shinto binding preserves traditional trimming in Tokyo (3)

11: Heavy metal group X (4)