Crossword Genius

Thinking debut requires one to conceal energy (7)

Ross

I believe the answer is:

opining

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'thinking' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for opining that I've seen before include "Expressing one's view" , "Thinking" .)

I've seen this clue in The Independent.
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