Crossword Genius

Frightens the cat (5)

Ross

I believe the answer is:

shoos

I'm a little stuck... Click here to teach me more about this clue!

'frightens' is the definition.
Although both the answer and definition are verbs in their -s form, I don't see how they can define each other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for shoos that I've seen before include "Drives away audibly" , "Scares off" .)

I've seen this clue in the Evening Standard.
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