Related Clues:

• This has something to do with the end of 8 down
• How the professor had a meal, just for the present
• The boy swallowed whatever you give him
• The professor had a consuming gift to pass on
• Get on in time and give it
• The learned man ate what you give him
• What has this got to do with 2 down?
• Give the professor what he swallowed
• Give no change in what's on your palm
• Learned to have eaten what you give him
• Learned enough to have fed for the present (6)
• Likewise, one was 9 across what you give him
• The professor consumed this for the 20 across
• The prof. swallowed what you give him
• The professor took what you give him, of course