Fixed broken digger (6)
I believe the answer is:
rigged
'fixed' is the definition.
(rigging is a kind of fixing)
'broken digger' is the wordplay.
'broken' indicates anagramming the letters.
'digger' anagrammed gives 'RIGGED'.
(Other definitions for rigged that I've seen before include "Manipulated by digger" , "Managed fraudulently - a tallship?" , "Set up fraudulently" , "Corruptly manipulated" , "Fraudulently fixed" .)