Catch a girl with a ring (5)
I believe the answer is:
lasso
'catch' is the definition.
(I know that lasso is a type of catch)
'a girl with a ring' is the wordplay.
'a girl' becomes 'lass' (lass can informally mean a girl).
'with' says to put letters next to each other.
'a ring' becomes 'o' (letter resembling a ring).
'lass'+'o'='LASSO'
(Other definitions for lasso that I've seen before include "Rope for a cowboy" , "Looped rope used to catch cattle" , "Cowboy's rope with sliding noose" , "Long rope with running noose" , "A cowboy's looped lariat" .)