Crossword Genius

Sleep you won't have when dog tired? (6)

Ross

I believe the answer is:

catnap

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

'sleep' is the definition.
(catnapping is a kind of sleeping)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for catnap that I've seen before include "Drop off" , "Kip" , "Brief doze" , "For a rest" , "(Tom's) snooze?" .)

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