Possible Clues:

• Run behind stage for climbing aid
• It helps you get up
• But it could be handy in a put-up job
• Ceiling painter's climbing aid
• Some exercise with 14 — this may help you get up
• Nylon damage that was adopted perhaps for something to climb?
• Climb up here to see the wrongly-spelt snake
• Run below stage for a scene-shifter's portable aid?
• Means of raising one's pace on run?
• Spelt out, calculator presents means of getting a rise