Balance very hard with old plough (9)
I believe the answer is:
steelyard
'balance' is the definition.
(I know that steelyard is a type of balance)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for steelyard that I've seen before include "Weighing machine" , "Portable balance for weighing items" .)
I've seen this clue in The Sunday Times and The Times.
Want a hint initially instead of a full solution?
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