Dolores, all wrong about Oscar (4)
I believe the answer is:
lola
'dolores' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I can't see?
'all wrong about oscar' is the wordplay.
'wrong' indicates anagramming the letters.
'about' is an insertion indicator.
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'all' with letters rearranged gives 'lla'.
'lla' going around 'o' is 'LOLA'.
Can you help me to learn more?
(Other definitions for lola that I've seen before include "song by 4 [THE KINKS]" , "Whatever -- wants (song); -- Montez, mistress of Ludwig I" .)