Possible Clues:

• OCC, I put there
• Da, eh? Oh, see! See, I put it there
• Da, eh?
• Occ I put, da, eh?
• That's Da, eh? That's 34 across
• Da, eh? That's the occiput there
• That could be OCC I put there for Da, eh?
• That must be the occiput, Da, eh?
• Da, eh? Maybe, but it's really 10 across