Good diction perhaps but it can cause offence (5,8)

'good' is the definition.
Both the definition and answer are adjectives.
Maybe they are linked in a way I don't understand?

'diction perhaps but it can cause offence' is the wordplay.
I cannot really understand how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is present in the answer.
'cause' could be 'king' (king is a kind of cause) and 'king' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?