Grappler has weight right: Lester thrown! (8)
I believe the answer is:
wrestler
'grappler' is the definition.
(I know that grappler can be written as wrestler)
'weight right lester thrown' is the wordplay.
'weight' becomes 'w' (short for weight).
'right' becomes 'r' (common abbreviation).
'thrown' indicates an anagram.
'lester' is an anagram of 'estler'.
'w'+'r'+'estler'='WRESTLER'
'has' is the link.
(Other definitions for wrestler that I've seen before include "One fighting in ring" , "Athlete trying to pin opponent to the ground" , "Athlete who gets to grips with an opponent?" , "One who grapples with an opponent sportingly?" , "Fighter who holds and throws" .)