Crossword Genius

Frightful animal picked up (6)

Ross

I believe the answer is:

grisly

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'frightful' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for grisly that I've seen before include "Horrific" , "Very unpleasant" , "Causing horror or revulsion" , "Causing horror or disgust" , "Horrible, ghastly" .)

I've seen this clue in The Guardian.
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