Green duck trapped by local copper (8)
I believe the answer is:
innocent
'green' is the definition.
(thesaurus)
'duck trapped by local copper' is the wordplay.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'trapped by' is an insertion indicator.
'local' becomes 'inn' (local can mean someone's local pub).
'copper' becomes 'cent' (I've seen this in another clue).
'inn'+'cent'='inncent'
'o' placed into 'inncent' is 'INNOCENT'.
(Other definitions for innocent that I've seen before include "Giovanni Lotario de' Conti?" , "Simple and ignorant of evil" , "Blameless - name of several Popes" , "Irreproachable" , "Free from evil or guilt" .)