What does the cryptic crossword clue "Part of the theory of relativity, for the radio presenter (5)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Part of the theory of relativity, for the radio presenter (5)

Times Cryptic #28739 | 21 Down | 2023-10-20

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I haven't cracked this one yet — but the brilliant team at Times for the Times have:

part of the equation E=MC^2 (theory of relativity).

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