Oik starts to yomp over Brecon Beacons, ending in Llandeilo (5)

I believe the answer is:

yobbo

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'oik' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'starts to yomp over brecon beacons ending in llandeilo' is the wordplay.
'starts to' indicates taking the first letters.
'ending in' says to take the final letters.
The first letters of 'yomp over brecon beacons' is 'yobb'.
The last letter of 'llandeilo' is 'o'.
'yobb'+'o'='YOBBO'

Can you help me to learn more?

(Other definitions for yobbo that I've seen before include "rough type" , "Rude and aggressive youth" , "Rowdy" , "Surly youth" , "Tough bloke" .)

I've seen this clue in The Independent.

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