Get beaten, having nothing approximate (5)
I believe the answer is:
loose
'approximate' is the definition.
(thesaurus)
'get beaten having nothing' is the wordplay.
'get beaten' becomes 'lose' (I've seen this in another clue).
'having' indicates putting letters inside.
'nothing' becomes 'O' (looks like zero - 0).
'lose' enclosing 'o' is 'LOOSE'.
(Other definitions for loose that I've seen before include "Lax - inaccurate - unbound" , "Not crammed" , "Untie(d)" , "wobbly" , "released from confinement" .)