Remarkably like Diana Ross? (9)

'remarkably' is the definition.
Both the answer and definition are adverbs. Perhaps there's a link between them I don't understand?

'like diana ross?' is the wordplay.
I cannot really understand how this works, but
'like' could be 'ly' (similar in meaning) and 'ly' is present in the answer.
'diana ross?' could be 'supreme' (Diana Ross was a member of the band The Supremes) and 'supreme' is found in 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?