Some hiker tramps around in this (4)

I believe the answer is:

trek

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

'some hiker tramps around' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'around' says the letters should be written in reverse.
'kert' is hidden within 'hiker tramps'.
'kert' back-to-front is 'TREK'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for trek that I've seen before include "A long arduous march" , "Difficult journey on foot" , "Long hike" , "Extended journey" , "A long arduous journey as in S Africa" .)

I've seen this clue in The Telegraph.

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