1: Incorrectly read pitch for a song (4,5)
2: Free for all by lack of padlocked freight compartments (2,5,6)
3: Boy gripping top of pine tree (5)
4: Inflexible yet adjusted (3)
5: Central Slovak airport damaged 16-down (9)
6: Heart-shaped ribbed cloth I order (9)
7: Shorebirds' tricks (5)
9: Swings needing repair by unknown stock gauge (4,4,5)
13: Head off switchboard operator's request for rental (9)
14: Ms Starr has a gun, a mere toy (9)
15: Commonly uses pretense in expenses (9)
18: Almost all choose fresh salmon (5)
19: In Germany, the monster returned from the east. (5)
21: Scale Ten after taxes (3)