Possible Clues:

• Booklet or leaflet
• A leaflet containing information
• Paine's revolutionary booklet
• Handout
• 'Booklet, leaflet (8)'
• A bit of reading matter, enough to absorb Henry in exercises
• Rate of progress by Dad towards rented tract
• Faint having injected speed, heading to therapist for source of information
• Secretary allowed to gather speed producing little book
• Lacking nitrogen hemp plant withers in the tract