What does the cryptic crossword clue "Corporation backed energy that makes no noise (4)" mean?

The definition is "that makes no noise". The wordplay uses charade, reversal. TUM (synonym of "Corporation") + E (synonym of "energy") [reversal: "backed"]; definition: "that makes no noise" The answer is MUTE.

Corporation backed energy that makes no noise (4)

Guardian Cryptic #28988 | 29 Down | 2023-02-08 flower

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