Ascending an alp using original approach (5)

I believe the answer is:

plana

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'original approach' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'ascending an alp' is the wordplay.
'ascending' says the letters should be written backwards.
'an'+'alp'='analp'
'analp' written backwards gives 'PLANA'.

'using' acts as a link.

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I've seen this clue in The Irish Times.

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