Delightful couple initially doing damage (8)
I believe the answer is:
charming
'delightful' is the definition.
(I've seen this before)
'couple initially doing damage' is the wordplay.
I cannot quite see how this works, but
'damage' could be 'harm' (synonyms) and 'harm' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for charming that I've seen before include "Lovely! - with 15a" , "Beguiling, enchanting" , "Delightful, attractive" .)