Cowboy might bring this girl round (5)

I believe the answer is:

lasso

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'cowboy might' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'this girl round' is the wordplay.
'this girl' becomes 'lass' (lass can informally mean a girl).
'round' becomes 'o' (o is a circular letter).
'lass'+'o'='LASSO'

'bring' is the link.

Can you help me to learn more?

(Other definitions for lasso that I've seen before include "snare" , "Rope with 20" , "Cowboy's noosed rope" , "Belgian composer" , "Ling-nosed rope" .)

I've seen this clue in The Telegraph.

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