### Clue: Copper coin couple found in yard, perhaps, long ago (5)
### Answer: CUBIT 
 ### Explanation: Definition: couple found in yard, perhaps, long ago
 CU(abbrev. for the element copper in chemistry) + BIT(a coin of low value, as in "thrupp'ny bit" or threepence in British currency pre-decimalisation.
Defn: A unit measure, long ago, of length of about 18 inches, two of which could therefore be found in a yard length, the equivalent of 36 inches.
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