Rope also tight round head of stallion (5)
I believe the answer is:
lasso
'rope' is the definition.
(lassoing is a kind of roping)
'also tight round head of stallion' is the wordplay.
'tight' indicates anagramming the letters (tight can mean drunk).
'round' means one lot of letters goes inside another.
'head of' says to take the initial letters.
The initial letter of 'stallion' is 's'.
'also' with letters rearranged gives 'laso'.
'laso' enclosing 's' is 'LASSO'.
(Other definitions for lasso that I've seen before include "use one for catching cattle" , "Rope for catching livestock" , "What cowboy uses" , "Cattle-catching rope" , "Ling-nosed rope" .)