Possible Clues:

• Form of insect - imagines more than one
• It's possible I shall leave, taking a year off, before the end of the grub
• How perhaps one claims to be a green light for the perfect insect
• Mine is a green light, says the perfect insect
• How I claim to give the green light to a perfect insect
• Pupa's future form
• Setter's past the mature stage
• Its occupants apparently in jeopardy in Boyd book
• I'm past ... being immature?
• I am to die having eaten a fully grown insect!