Walk, run, climb using this (4,6)

I believe the answer is:

step ladder

'climb using this' is the definition.

'walk run' is the wordplay.
'walk' becomes 'step' (I've seen this before).
'run' becomes 'ladder' (both can mean a rip in tights).
'step'+'ladder'='STEP-LADDER'

(Another definition for step ladder that I've seen is " something a sceneshifter may use".)

I've seen this clue in The Times.

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