Unburden (3)
'unburden' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rid that I've seen before include "Free (person of affliction)" , "Free (someone of something unwanted)" , "Free, disencumber" , "Clear, remove" , "Free from something unpleasant" .)
'unburden' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for unload that I've seen before include "Remove goods from (a vehicle or ship)" , "Take cargo off (a ship)" , "Remove cargo from ship or charge from gun" , "Get rid" , "Take goods from (ship)" .)