Mother’s ruin ruined mother, putting up counterfeit gold at no fixed abode (7)
I believe the answer is:
roaming
'mother's ruin ruined mother putting up counterfeit gold' is the definition.
I can't tell whether this definition defines the answer.
'at no fixed abode' is the wordplay.
I cannot really see how this works, but
'at' could be 'in' (synonymous in some cases - eg at school, in school) and 'in' is present in the answer.
'no' could be 'o' (O resembles 0) and 'o' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for roaming that I've seen before include "Moving about" , "Roving" , "wandering around" , "Using a mobile on another network" , "Ranging widely" .)