Beat heavily! (5)

I believe the answer is:

pound

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'beat' is the definition.
(I know that beat can be written as pound)

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

Can you help me to learn more?

(Other definitions for pound that I've seen before include "Hit -money - pen" , "Batter" , "Enclosure for stray animals" , "Powder - 16 oz - 100p" , "100 6 [PENNIES]" .)

I've seen this clue in the Evening Standard.

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