Till (6)
'till' is the definition.
(ploughing is a kind of tilling)
This is the entire clue.
(Other definitions for plough that I've seen before include "Farm tool and group of stars" , "fail to > turn up on farm" , "Seven stars on the farm?" , "Make furrows" , "Farming implement; constellation" .)
'till' is the definition.
(synonyms)
This is all the clue.
'till' is the definition.
(cash register is a kind of till)
This is all the clue.
(Other definitions for cash register that I've seen before include "money machine" , "one may advise change" , "Shop till" , "Machine used in shops" .)