Ensnare a girl with love (5)
I believe the answer is:
lasso
'ensnare' is the definition.
(thesaurus)
'a girl with love' is the wordplay.
'a girl' becomes 'lass' (lass can informally mean a girl).
'with' says to put letters next to each other.
'love' becomes 'o' (love means zero in tennis).
'lass'+'o'='LASSO'
(Other definitions for lasso that I've seen before include "Belgian composer" , "something to catch beast liable to run off" , "Rope for throwing" , "Long rope with running noose" , "Ling-nosed rope" .)