Entertainer Bill grabs wild boar (7)
I believe the answer is:
acrobat
'entertainer' is the definition.
(I've seen this before)
'bill grabs wild boar' is the wordplay.
'bill' becomes 'act' (I've seen this in other clues).
'grabs' is an insertion indicator.
'wild' indicates an anagram.
'boar' with letters rearranged gives 'roba'.
'act' going around 'roba' is 'ACROBAT'.
(Other definitions for acrobat that I've seen before include "Gymnastic performer" , "Circus star" , "Athletic type" , "Performer of great agility and coordination" , "Performing gymnast" .)