1: Flower festival is pointless (5)
3: Multiple notes keeping youth leader youthful (4-5)
8: Mary-Jane crochets her Pop a jumper (11)
11: Non-clerical song (3)
12: In all, just a little peak. (3)
13: Arranged date in Cairo means extermination (11)
14: Fires possibly singe it (7)
15: Reportedly is nostalgic for wife (3)
16: Perfect counter-spy equipment (3)
18: One final, huge Greek goddess (3)
19: Heavy metal group X (4)
21: Young birds or seals may be heard (7)
23: Fashion term heartless: Feeling up Blossom (6-2-3)
24: A representative may be a scamp (3)
25: Choose to take the top off (3)
26: Black arts and demons concerned with Homer's issue? (4,7)
27: Crooner Mel: famous, loveless, suffering (9)
28: Scotsman turns to notice drifter (5)