1: Frantically parries swords (7)
2: Create an impression on an envelope? (5)
3: Person with fixed notions is pretty sore, upset about the introduction of Ebonics (11)
5: Martyr fighting segregation (5,6)
6: Help found in Adelaide. (3)
7: Twice French mounted plain bovines (5)
8: Evita, for example, making false claim about American (7)
12: Farmyard creatures defining an unlikely story? (4,3,4)
13: Exchange concealed proprietary knowledge (5,6)
15: Bounder beheaded by slippery swimmer (3)
17: Chain some; cuff objectors (3)
18: Musical work for double act with nothing new (7)
20: Men caught in vile deed should be 'fixed' (7)
22: Jacket feature from copy seen in fifties (5)
24: Pervert stripped in mineral water (5)
26: Clean oneself, but in reverse (3)
27: Drongo lacks even a pet (3)