Means to climb stage with large snake (10)
I believe the answer is:
stepladder
'means to climb' is the definition.
(you climb a stepladder)
'stage with large snake' is the wordplay.
'stage' becomes 'step' (I've seen this in other clues).
'with large' becomes 'l' (eg in clothes sizes. I am not sure about the 'with' bit.).
'snake' becomes 'adder' (adder is a kind of snake).
'step'+'l'+'adder'='STEPLADDER'
Can you help me to learn more?
(Other definitions for stepladder that I've seen before include "Painter's mate" , "Portable means of ascent" , "Domestic climbing aid" , "Short folding climbing frame" , "Help for climber" .)