Possible Clues:

• (A person's) will
• Will try what comes at the end before tea
• Will trial include volunteers?
• Will is offensive about male organ
• Will try, having meant to give a whirl to
• Will try one morning and ten more
• That will be the last way to leave
• Proof
• Examine catkin - it could be old or new
• This will try a response before tea, perhaps