Crossword Genius

Rent is audibly increased (4)

Ross

I believe the answer is:

hire

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'rent' is the definition.
(rent can mean to hire something out)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for hire that I've seen before include "Engage; rent" , "Rent, employ" , "Employ (for wages)" , "Charter, employ" , "Pay to use something" .)

I've seen this clue in The Mirror.
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