Get beaten, with nothing approximate (5)
I believe the answer is:
loose
'approximate' is the definition.
(thesaurus)
'get beaten with nothing' is the wordplay.
'get beaten' becomes 'lose'.
'with' indicates putting letters inside.
'nothing' becomes 'o' (looks like zero - 0).
'lose' placed around 'o' is 'LOOSE'.
(Other definitions for loose that I've seen before include "Not restrained or attached" , "Relaxed; set free" , "escaped!" , "Not strict" , "Grant freedom to" .)