It might be the top part of emblem on a design (8)

I believe the answer is:

lemonade

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'it might be the top part' is the definition.
The definition suggests a singular noun which matches the answer.

'of emblem on a design' is the wordplay.
'of' indicates a hidden word.
'LEMONADE' can be found hidden inside 'emblem on a design'.

Can you help me to learn more?

(Other definitions for lemonade that I've seen before include "(Usually) fizzy drink" , "This should refresh" , "Fizzy pop" , "Leo named oddly for a soft drink" , "Meal done (anag.)" .)

I've seen this clue in The Independent.

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