1: Song is a gas (3)

3: Shinny up and start to cut branch (5)

6: Having red nose, turned back (7)

7: Immediately placed in an awkward situation (2,3,4)

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

12: Set display on the Fourth of July (5)

13: Infection leads from partly uncooked steak (3)

1: Number One in facetiousness (3)

2: Road without a pole (4)

3: Confined bear without a trade (9)

4: Frost over mid-January during epic exploit (3,2)

5: Black gets closing party (5)

7: Tarka beheads scoundrel (5)

8: This is always resplendent, adorning heads (5)

10: Tweak with wrong end of a pin (3)

11: Reportedly is nostalgic for wife (3)