Cowboy might bring this girl round (5)
I believe the answer is:
lasso
'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" .)