Local regulation we ably amended (6)
I believe the answer is:
byelaw
'local regulation' is the definition.
The definition suggests a singular noun which matches the answer.
'we ably amended' is the wordplay.
'amended' is an anagram indicator.
'we'+'ably'='weably'
'weably' with letters rearranged gives 'BYELAW'.
Can you help me to learn more?
(Other definitions for byelaw that I've seen before include "Rule made by a local authority" , "Local authority regulation" .)