Related Clues:

• Yes, it's on board that you get to monkey with it at the double
• Not the negative sound of 21 across
• Yes, it's doubled for the primate
• Yes, that would sound less than human on board
• It's yes for the primate, and for 7 down
• Yes, it's on board that you'll find the primate
• 1 across
• On board one is agreeable to have something subhuman
• Sounds as if it's yourself that is so agreeable
• Might it be doubled for a primate? That's so
• How the primate is willing to be on board
• One board one would show willing like this at the double
• Yes, that gets doubled for the primate
• Yes, it's on board at the double
• Yes, one comes at the double on board