Crossword Genius

Am turning to leave dog? Tough (5)

Ross

I believe the answer is:

stiff

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for stiff that I've seen before include "Starched, rigid" , "Firm" , "18 [HARD]" , "One dead" , "Not giving" .)

I've seen this clue in The Times.
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