Being the best, is typically topping (5)

I believe the answer is:
cream
'being the best' is the definition.
(as in 'the cream of the crop')
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for cream that I've seen before include "The best part -of the crop" , "best people" , "An off-white shade" , "Best part of the milk" , "Fat-rich part of milk" .)
