Grisly end for the foxy type (3)

I believe the answer is:

sly

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

'end for the foxy type' is the definition.
I can't tell whether this definition defines the answer.

'grisly' is the wordplay.
'SLY' is hidden within the letters.
But, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for sly that I've seen before include "Unpleasantly cunning and secretive" , "Cunning; surreptitious" , "Artful" , "Wily, shifty" , "Devious, cunning" .)

I've seen this clue in the Evening Standard.

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