I step out onto trail (5)

I believe the answer is:

piste

I'm a little stuck... Click here to teach me more about this clue!

'trail' is the definition.
(I know that piste is a type of ski run)

'i step out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'i'+'step'='istep'
'istep' anagrammed gives 'PISTE'.

'onto' acts as a link.
I am not very happy about this link. 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 "Skiing run" , "Ski slope" , "Skiing course" , "Ski trail" , "A ski run of compacted snow" .)

I've seen this clue in The Mirror.

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