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' (I've seen this in another clue).
'with' means one lot of letters goes inside another.
'nothing' becomes 'O' (O resembles 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" .)