Start on alpine trail for this! (6)

I believe the answer is:

ascent

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'this' is the definition.
The definition suggests a singular noun which matches the answer.

'start on alpine trail' is the wordplay.
'start on' indicates taking the first letters (I've seen 'starts on' mean this).
'trail' becomes 'scent' (an animal's trail is its scent).
The initial letter of 'alpine' is 'a'.
'a'+'scent'='ASCENT'

'for' is the link.

Can you help me to learn more?

(Other definitions for ascent that I've seen before include "Acclivity" , "A climb or way up" , "Act of moving upwards" , "Uphill journey" , "Enacts in climb" .)

I've seen this clue in The Sun.

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