Adulterating gold for example is crooked (6)
I believe the answer is:
dogleg
'adulterating' is the definition.
Both the definition and answer are adjectives.
Perhaps there's an association between them I don't understand?
'gold for example is crooked' is the wordplay.
I cannot really understand how this works, but
an anagram of 'gold' is 'dogl' which is within the answer.
'example' could be 'eg' (short for 'exempli gratia', 'for example' in Latin) and 'eg' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for dogleg that I've seen before include "A sharp bend of canine analogy" , "Angle in a golfing fairway" , "the 17th at St Andrews?" , "Crooked golf hole" , "Crook" .)