Had old money dropped repeatedly in ditch

I believe the answer is:

ha-ha

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(Other definitions for ha-ha that I've seen before include "Loud laugh" , "Ditch with a wall in it - that's a laugh" , "Ditch with wall in it - sounds funny" , "Low ditch with wall in it" , "Sunk ditch - laugh!" .)

I've seen this clue in The Telegraph.

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