Rope in a girl with a ring (5)
I believe the answer is:
lasso
'rope in' is the definition.
(I've seen this before)
'a girl with a ring' is the wordplay.
'a girl' becomes 'lass' (lass can informally mean a girl).
'with' means one lot of letters go next to another.
'a ring' becomes 'o' (letter resembling a ring).
'lass'+'o'='LASSO'
(Other definitions for lasso that I've seen before include "Cowcatcher" , "which may be catching" , "Cowboy's rope with sliding noose" , "Cattle-catching rope" , "Cow-catching rope?" .)