I step out onto slope (5)

I believe the answer is:

piste

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'slope' is the definition.
(I have seen 'slippery slope' mean 'piste' so perhaps 'slope' could also mean 'piste')

'i step out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'i'+'step'='istep'
'istep' with letters rearranged gives 'PISTE'.

'onto' is the link.
This may not be correct. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for piste that I've seen before include "A ski run of compacted snow" , "Skiing course" , "Ski slope" , "Skiing trail" , "Ski-slope" .)

I've seen this clue in The Mirror.

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