Dodgy coins ref used for evidence in court (8)
I believe the answer is:
forensic
'evidence in court' is the definition.
'forensic' can be an answer for 'evidence' (I have seen 'Such evidence' mean 'forensic' so perhaps 'evidence' could also mean 'forensic'). I'm not sure about the 'in court' bit.
'dodgy coins ref' is the wordplay.
'dodgy' is an anagram indicator (a dodgy or wrong order of the letters).
'coins'+'ref'='coinsref'
'coinsref' is an anagram of 'FORENSIC'.
'used for' acts as a link.
Can you help me to learn more?
(Other definitions for forensic that I've seen before include "Branch of medicine dealing with the law" , "Relating to the application of scientific methods in criminal investigation" , "Conifers (anag)" , "Used in lawcourts, like conifers" , "Using science to investigate crime" .)