Crossword Genius

Speak harshly, maybe heatedly (5)

Ross

I believe the answer is:

grate

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'speak' is the definition.
Although both the answer and definition are verbs in their base form, I cannot see how they can define each other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for grate that I've seen before include "Grind, rasp" , "Reduce to small shreds" , "Grind (cheese)" , "Grind (teeth)" , "irritating" .)

I've seen this clue in the Evening Standard.
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