What does the cryptic crossword clue "It's not free to broadcast with higher frequency (7)" 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.

It's not free to broadcast with higher frequency (7)

Guardian Cryptic #26540 | 20 Across | 2015-04-08 flower

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