Wash clothes (7)
I believe the answer is:
launder
'wash clothes' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for launder that I've seen before include "Clean, clothes or mafia money" , "Wash and iron linen" , "Trough" , "Make illegal (money) legitimate" , "Wash, starch and iron" .)