Related Clues:
- Keeps going despite fatigue ... or a hint to three features of this puzzle
- Very crafty and clever
- Very cleverly crafty
- Like a wink or a nudge, maybe
- ___ like a fox
- Like some human dogs
- Apt letters missing from '_tea_th_'
- Word that becomes its own synonym if you change its first letter to WI
- Ever so clever
- Having designs
- Like a fox with a twinkle in its eye
- Like a person hearing "Aren't you so clever"
- Like anyone pulling a sleight-of-hand
- Like a rogue
- On the __: sneakily