Like a new drum, with a perfect record? (8)

I believe the answer is:

unbeaten

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'like' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for unbeaten that I've seen before include "Not yet defeated" , "Always top" , "Not punished" , "Not having lost a match" , "like the schoolboys of today?" .)

I've seen this clue in the Sydney Morning Herald.

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