Pondered topping what the entertainer did (5)

I believe the answer is:

mused

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'pondered' is the definition.
('muse' can be a synonym of 'ponder')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for mused that I've seen before include "Contemplated" , "Reflected or pondered" , "Reflected in silence" , "Was deep in thought" , "'Meditated, mulled (5)'" .)

I've seen this clue in The Times.

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