“Good gracious!” you repeat, “my love” (4,4)
I believe the answer is:
dear dear
'you repeat my love' is the definition.
I know nothing about this answer so I can't judge whether this works.
'good gracious' is the wordplay.
'good' becomes 'dear' (synonyms).
'gracious' becomes 'dear' (I can't justify this - if you can you should give a lot more credence to this answer).
'dear'+'dear'='DEAR DEAR'
Can you help me to learn more?
(Other definitions for dear dear that I've seen before include "Expression of dismay" , "Too bad!" , "That's a pity!" .)