Crossword Genius

Forbidding scowl has expert leaving (4)

Ross

I believe the answer is:

grim

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'forbidding' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for grim that I've seen before include "Ghastly" , "Formidably stern" , "Frightful" , "Stern, cruel" , "Dreadful" .)

I've seen this clue in The Mirror.
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