Assistant Chief Constable (Retired) saving Euros built up (8)
I believe the answer is:
accreted
'built up' is the definition.
(I've seen this in another clue)
'assistant chief constable retired saving euros' is the wordplay.
I cannot quite understand how this works, but
'retired' could be 'ret' (e.g. following the name of a retired army officer) and 'ret' is found in the answer.
'euros' could be 'e' and 'e' is found in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for accreted that I've seen is " Accumulated".)