1A - Old invaders took his flanks (5)
G????
2D - Girl upset about lads being oddly deficient (5) ??S?A
3D - "Cut" says lady during dance
(5) ??L?A
3rd letter of 1A is 1st letter of 2D
Last letter of 1A is 1st letter of 3D
13D - Object now within a container
(5) P?I?T
Many thanks in advance.