The power of mathematics (8)

I believe the answer is:

exponent

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'the power' is the definition.
('exponent' can be a synonym of 'power')

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

Can you help me to learn more?

(Other definitions for exponent that I've seen before include "Interpreter, advocate; (maths.) power" , "skilful practitioner" , "Interpretive artist or performer" , "Interpreter - performer" , "Skilled performer" .)

I've seen this clue in The Telegraph.

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