1: Bounder beheaded by slippery swimmer (3)
3: Prepare canvas with a colour like red, blue or yellow? (5)
5: Sibling rivalry's beginning - worry about it (7)
7: Choice share divided by the Spanish (9)
9: Lawless brute having fun with fair play (7)
11: Tender translator of runes (5)
12: Managed in lower Antwerp (3)